diff --git a/BUILD-PLAN.md b/BUILD-PLAN.md
index 2896da5..e2e4565 100644
--- a/BUILD-PLAN.md
+++ b/BUILD-PLAN.md
@@ -16,6 +16,7 @@ Hardware gates block *release of that sprint*, not filing, and not starting codi
 | M4 | Measurement | 18–22 | `chartread.mock`; 39+ classifier fixtures; ΔE₀₀; snapshot/average | Detect real instrument; one strip or XY through Done → `.ti3` |
 | M5 | Profile / verify / install | 23–27 | colprof → `.icc`; profcheck parse; atomic history; install into temp dir | Full `.ti1`→`.icc`; profile visible in ColorSync Utility |
 | M6 | Gamut, Stage 0, CGATS, release | 28–32 | `.gam` fixtures; cal argv; CGATS round-trip; signed sidecars; dmgbuild | Stage 0 on a real printer; gamut of a real profile |
+| M7 | Deduplicate & consolidate | 79–86 | Shared runner loop; JSONFileStore; preset↔config maps; Notice/log helper; ProcessManager factory; PrintSession VM; identity + colour-type cleanup | N/A |
 | Later | Quartz / TargetPrint | 16 | `ICCeryPrintKit` standalone + seam test | 1:1 on paper vs TIFF |
 
 Issue **16 is not an M3 or M6 exit gate.**
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/ArgsBuilder.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/ArgsBuilder.swift
new file mode 100644
index 0000000..c858a06
--- /dev/null
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/ArgsBuilder.swift
@@ -0,0 +1,35 @@
+import Foundation
+
+/// Tiny argv helpers. Each Argyll tool keeps its own `*Args` enum —
+/// `-d` / `-u` / `-r` still mean different things per binary.
+public enum ArgsBuilder {
+    /// `["-f", value]` when `value` is non-nil.
+    public static func option(_ flag: String, _ value: String?) -> [String] {
+        guard let value else { return [] }
+        return [flag, value]
+    }
+
+    /// `["-f", trimmed]` when trimmed is non-empty.
+    public static func optionIfNonEmpty(_ flag: String, _ value: String?) -> [String] {
+        guard let raw = value?.trimmingCharacters(in: .whitespacesAndNewlines),
+              !raw.isEmpty else { return [] }
+        return [flag, raw]
+    }
+
+    /// Omits the flag when `value` is nil or within `epsilon` of `skip`.
+    public static func optionUnlessApprox(
+        _ flag: String,
+        _ value: Double?,
+        skip: Double,
+        epsilon: Double = 0.001,
+        format: String = "%.2f"
+    ) -> [String] {
+        guard let value, abs(value - skip) >= epsilon else { return [] }
+        return [flag, String(format: format, locale: Locale(identifier: "en_US_POSIX"), value)]
+    }
+
+    /// Bare flag when `when` is true.
+    public static func flag(_ flag: String, when: Bool) -> [String] {
+        when ? [flag] : []
+    }
+}
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/ArgyllRunner.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/ArgyllRunner.swift
index d3a7c29..e3aa959 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/ArgyllRunner.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/ArgyllRunner.swift
@@ -2,43 +2,41 @@ import Foundation
 
 /// Errors from `ArgyllRunner` executions.
 public enum ArgyllRunnerError: LocalizedError, Equatable, Sendable {
-    case processFailed(code: Int32, logs: [String])
+    case toolFailed(tool: String, code: Int32, logs: [String])
     case missingArtefact(String)
     case malformedManifest(String)
     case instrumentDetectionFailed(String)
-    case chartreadFailed(String)
-    case averageFailed(String)
-    case colprofFailed(String)
-    case printcalFailed(String)
-    case applycalFailed(String)
-    case iccgamutFailed(String)
-    case profcheckFailed(String)
     case profcheckUnparseable
 
     public var errorDescription: String? {
         switch self {
-        case .processFailed(let code, _):
-            return "Process exited with code \(code)"
+        case .toolFailed(let tool, let code, let logs):
+            let detail = logs.last.flatMap { $0.isEmpty ? nil : $0 }
+                ?? "exited with code \(code)"
+            switch tool {
+            case "chartread":
+                return "Chartread failed: \(detail)"
+            case "average":
+                return "Averaging failed: \(detail)"
+            case "colprof":
+                return "Profile creation failed: \(detail)"
+            case "printcal":
+                return "Calibration curve computation failed: \(detail)"
+            case "applycal":
+                return "Apply calibration failed: \(detail)"
+            case "iccgamut":
+                return "Gamut extraction failed: \(detail)"
+            case "profcheck":
+                return "Profile verification failed: \(detail)"
+            default:
+                return "Process exited with code \(code)"
+            }
         case .missingArtefact(let path):
             return "Expected output file was not created: \(path)"
         case .malformedManifest(let reason):
             return "Failed to parse printtarg manifest: \(reason)"
         case .instrumentDetectionFailed(let reason):
             return "Instrument detection failed: \(reason)"
-        case .chartreadFailed(let reason):
-            return "Chartread failed: \(reason)"
-        case .averageFailed(let reason):
-            return "Averaging failed: \(reason)"
-        case .colprofFailed(let reason):
-            return "Profile creation failed: \(reason)"
-        case .printcalFailed(let reason):
-            return "Calibration curve computation failed: \(reason)"
-        case .applycalFailed(let reason):
-            return "Apply calibration failed: \(reason)"
-        case .iccgamutFailed(let reason):
-            return "Gamut extraction failed: \(reason)"
-        case .profcheckFailed(let reason):
-            return "Profile verification failed: \(reason)"
         case .profcheckUnparseable:
             return "Profile verification produced unparseable output"
         }
@@ -76,6 +74,48 @@ public struct ArgyllRunner: Sendable {
         self.binaryResolver = binaryResolver
     }
 
+    // MARK: - Shared streaming loop (issue #79)
+
+    private func runStreamingTool(
+        name: String,
+        id: String,
+        arguments: [String],
+        workingDirectory: URL?,
+        flushPartialLines: Bool = false,
+        onLogBatch: (@Sendable ([String]) -> Void)? = nil
+    ) async throws -> CollectedRun {
+        let binaryURL = binaryResolver.resolve(name)
+        await ensureNotRunning(id: id)
+        let events = processManager.events()
+        try await processManager.runStreaming(
+            id: id,
+            binary: binaryURL,
+            arguments: arguments,
+            workingDirectory: workingDirectory
+        )
+        let run = await collect(
+            id: id,
+            events: events,
+            onLogBatch: onLogBatch,
+            flushPartialLines: flushPartialLines
+        )
+        guard run.exitCode == 0 else {
+            throw ArgyllRunnerError.toolFailed(
+                tool: name,
+                code: run.exitCode ?? -1,
+                logs: run.lines
+            )
+        }
+        return run
+    }
+
+    private func requireArtefact(_ url: URL) throws -> URL {
+        guard FileManager.default.fileExists(atPath: url.path) else {
+            throw ArgyllRunnerError.missingArtefact(url.path)
+        }
+        return url
+    }
+
     // MARK: - targen (Stage 1)
 
     /// Runs `targen` streaming, collecting logs and verifying `.ti1`
@@ -87,27 +127,16 @@ public struct ArgyllRunner: Sendable {
         let cleanBasename = try PathSecurity.sanitizeBasename(config.basename)
         let cwd = PathSecurity.resolveSafeCwd(config.workingDirectory)
         let args = try TargenArgs.build(config: config)
-        let binaryURL = binaryResolver.resolve("targen")
         let processId = ProcessID.targen(cleanBasename)
-
-        await ensureNotRunning(id: processId)
-        let events = processManager.events()
-        try await processManager.runStreaming(
+        _ = try await runStreamingTool(
+            name: "targen",
             id: processId,
-            binary: binaryURL,
             arguments: args,
-            workingDirectory: cwd
+            workingDirectory: cwd,
+            onLogBatch: onLogBatch
         )
-        let run = await collect(id: processId, events: events, onLogBatch: onLogBatch)
-
-        guard run.exitCode == 0 else {
-            throw ArgyllRunnerError.processFailed(code: run.exitCode ?? -1, logs: run.lines)
-        }
         let ti1URL = cwd.appendingPathComponent("\(cleanBasename).ti1")
-        guard FileManager.default.fileExists(atPath: ti1URL.path) else {
-            throw ArgyllRunnerError.missingArtefact(ti1URL.path)
-        }
-        return ti1URL
+        return try requireArtefact(ti1URL)
     }
 
     // MARK: - printtarg (Stage 2)
@@ -122,26 +151,15 @@ public struct ArgyllRunner: Sendable {
         let cleanBasename = try PathSecurity.sanitizeBasename(config.basename)
         let cwd = PathSecurity.resolveSafeCwd(config.workingDirectory)
         let args = try PrinttargArgs.build(config: config)
-        let binaryURL = binaryResolver.resolve("printtarg")
         let processId = ProcessID.printtarg(cleanBasename)
-
-        await ensureNotRunning(id: processId)
-        let events = processManager.events()
-        try await processManager.runStreaming(
+        let run = try await runStreamingTool(
+            name: "printtarg",
             id: processId,
-            binary: binaryURL,
             arguments: args,
-            workingDirectory: cwd
+            workingDirectory: cwd,
+            onLogBatch: onLogBatch
         )
-        let run = await collect(id: processId, events: events, onLogBatch: onLogBatch)
-
-        guard run.exitCode == 0 else {
-            throw ArgyllRunnerError.processFailed(code: run.exitCode ?? -1, logs: run.lines)
-        }
-        let ti2URL = cwd.appendingPathComponent("\(cleanBasename).ti2")
-        guard FileManager.default.fileExists(atPath: ti2URL.path) else {
-            throw ArgyllRunnerError.missingArtefact(ti2URL.path)
-        }
+        let ti2URL = try requireArtefact(cwd.appendingPathComponent("\(cleanBasename).ti2"))
 
         let manifest: PrinttargManifest
         do {
@@ -339,28 +357,16 @@ public struct ArgyllRunner: Sendable {
     ) async throws -> URL {
         let cwd = PathSecurity.resolveSafeCwd(config.workingDirectory)
         let args = try AverageArgs.build(config: config)
-        let binaryURL = binaryResolver.resolve("average")
         let processId = ProcessID.average(config.basename)
-
-        await ensureNotRunning(id: processId)
-        let events = processManager.events()
-        try await processManager.runStreaming(
+        _ = try await runStreamingTool(
+            name: "average",
             id: processId,
-            binary: binaryURL,
             arguments: args,
-            workingDirectory: cwd
+            workingDirectory: cwd,
+            onLogBatch: onLogBatch
         )
-        let run = await collect(id: processId, events: events, onLogBatch: onLogBatch)
-
-        guard run.exitCode == 0 else {
-            throw ArgyllRunnerError.averageFailed("average exited with code \(run.exitCode ?? -1)")
-        }
-
         let canonical = cwd.appendingPathComponent("\(config.basename).ti3")
-        guard FileManager.default.fileExists(atPath: canonical.path) else {
-            throw ArgyllRunnerError.missingArtefact(canonical.path)
-        }
-        return canonical
+        return try requireArtefact(canonical)
     }
 
     // MARK: - colprof (Stage 4)
@@ -374,29 +380,15 @@ public struct ArgyllRunner: Sendable {
         let cleanBasename = try PathSecurity.sanitizeBasename(config.basename)
         let cwd = PathSecurity.resolveSafeCwd(config.workingDirectory)
         let args = try ColprofArgs.build(config: config)
-        let binaryURL = binaryResolver.resolve("colprof")
         let processId = ProcessID.colprof(cleanBasename)
-
-        await ensureNotRunning(id: processId)
-        let events = processManager.events()
-        try await processManager.runStreaming(
+        _ = try await runStreamingTool(
+            name: "colprof",
             id: processId,
-            binary: binaryURL,
             arguments: args,
-            workingDirectory: cwd
+            workingDirectory: cwd,
+            flushPartialLines: true,
+            onLogBatch: onLogBatch
         )
-        let run = await collect(
-            id: processId,
-            events: events,
-            onLogBatch: onLogBatch,
-            flushPartialLines: true
-        )
-
-        guard run.exitCode == 0 else {
-            throw ArgyllRunnerError.colprofFailed(
-                "colprof exited with code \(run.exitCode ?? -1)"
-            )
-        }
 
         // Argyll may produce `.icm` on Windows, but on macOS we expect `.icc`.
         // `resolveProfile` checks `.icm` first, then `.icc`, matching #69.
@@ -456,16 +448,20 @@ public struct ArgyllRunner: Sendable {
             if Task.isCancelled {
                 throw CancellationError()
             }
-            throw ArgyllRunnerError.applycalFailed(
-                result.stderr.isEmpty
+            throw ArgyllRunnerError.toolFailed(
+                tool: "applycal",
+                code: result.exitCode,
+                logs: [result.stderr.isEmpty
                     ? "applycal exited with code \(result.exitCode)"
-                    : result.stderr
+                    : result.stderr]
             )
         }
 
         guard fm.fileExists(atPath: tmpURL.path) else {
-            throw ArgyllRunnerError.applycalFailed(
-                "applycal did not create temp profile"
+            throw ArgyllRunnerError.toolFailed(
+                tool: "applycal",
+                code: -1,
+                logs: ["applycal did not create temp profile"]
             )
         }
 
@@ -473,8 +469,10 @@ public struct ArgyllRunner: Sendable {
         let size = attrs?[.size] as? UInt64 ?? 0
         guard size >= 128 else {
             try? fm.removeItem(at: tmpURL)
-            throw ArgyllRunnerError.applycalFailed(
-                "calibrated profile is too small (\(size) bytes)"
+            throw ArgyllRunnerError.toolFailed(
+                tool: "applycal",
+                code: -1,
+                logs: ["calibrated profile is too small (\(size) bytes)"]
             )
         }
 
@@ -486,7 +484,11 @@ public struct ArgyllRunner: Sendable {
             }
         } catch {
             try? fm.removeItem(at: tmpURL)
-            throw ArgyllRunnerError.applycalFailed(error.localizedDescription)
+            throw ArgyllRunnerError.toolFailed(
+                tool: "applycal",
+                code: -1,
+                logs: [error.localizedDescription]
+            )
         }
 
         return inputURL
@@ -503,30 +505,16 @@ public struct ArgyllRunner: Sendable {
         let cwd = profileURL.deletingLastPathComponent()
         let stem = profileURL.deletingPathExtension().lastPathComponent
         let args = try IccgamutArgs.build(config: config)
-        let binaryURL = binaryResolver.resolve("iccgamut")
         let processId = ProcessID.iccgamut(stem: stem)
-
-        await ensureNotRunning(id: processId)
-        let events = processManager.events()
-        try await processManager.runStreaming(
+        _ = try await runStreamingTool(
+            name: "iccgamut",
             id: processId,
-            binary: binaryURL,
             arguments: args,
-            workingDirectory: cwd
+            workingDirectory: cwd,
+            onLogBatch: onLogBatch
         )
-        let run = await collect(id: processId, events: events, onLogBatch: onLogBatch)
-
-        guard run.exitCode == 0 else {
-            throw ArgyllRunnerError.iccgamutFailed(
-                "iccgamut exited with code \(run.exitCode ?? -1)"
-            )
-        }
-
         let gamURL = cwd.appendingPathComponent("\(stem).gam")
-        guard FileManager.default.fileExists(atPath: gamURL.path) else {
-            throw ArgyllRunnerError.missingArtefact(gamURL.path)
-        }
-        return gamURL
+        return try requireArtefact(gamURL)
     }
 
     // MARK: - profcheck (Stage 5 verification)
@@ -539,30 +527,18 @@ public struct ArgyllRunner: Sendable {
         let cwd = config.ti3URL.deletingLastPathComponent()
         let ti3Path = config.ti3URL.path
 
-        let iccURL = Self.resolveProfileForVerification(config.iccURL)
+        let iccURL = ArtefactProbe.resolveProfile(config.iccURL)
         let config = ProfcheckConfig(ti3URL: config.ti3URL, iccURL: iccURL)
 
         let args = try ProfcheckArgs.build(config: config)
-        let binaryURL = binaryResolver.resolve("profcheck")
         let processId = ProcessID.profcheck(ti3Path: ti3Path)
-
-        await ensureNotRunning(id: processId)
-        let events = processManager.events()
-        try await processManager.runStreaming(
+        let run = try await runStreamingTool(
+            name: "profcheck",
             id: processId,
-            binary: binaryURL,
             arguments: args,
-            workingDirectory: cwd
+            workingDirectory: cwd,
+            onLogBatch: onLogBatch
         )
-        let run = await collect(id: processId, events: events, onLogBatch: onLogBatch)
-
-        guard run.exitCode == 0 else {
-            throw ArgyllRunnerError.profcheckFailed(
-                run.stderr.isEmpty
-                    ? "profcheck exited with code \(run.exitCode ?? -1)"
-                    : run.stderr
-            )
-        }
 
         let output = (run.stdout + "\n" + run.stderr).trimmingCharacters(in: .whitespacesAndNewlines)
         let report = ProfcheckParser.parse(output)
@@ -572,15 +548,6 @@ public struct ArgyllRunner: Sendable {
         return report
     }
 
-    private static func resolveProfileForVerification(_ url: URL) -> URL {
-        let fm = FileManager.default
-        if fm.fileExists(atPath: url.path) { return url }
-        let alt = url.pathExtension.lowercased() == "icc"
-            ? url.deletingPathExtension().appendingPathExtension("icm")
-            : url.deletingPathExtension().appendingPathExtension("icc")
-        return fm.fileExists(atPath: alt.path) ? alt : url
-    }
-
     // MARK: - chartread (Stage 3 interactive)
 
     /// Runs `chartread` and returns an `AsyncStream` of typed events.
@@ -596,7 +563,7 @@ public struct ArgyllRunner: Sendable {
             cwd = PathSecurity.resolveSafeCwd(config.workingDirectory)
         } catch {
             return AsyncStream { continuation in
-                continuation.yield(.failed(ArgyllRunnerError.chartreadFailed(error.localizedDescription)))
+                continuation.yield(.failed(ArgyllRunnerError.toolFailed(tool: "chartread", code: -1, logs: [error.localizedDescription])))
                 continuation.finish()
             }
         }
@@ -606,7 +573,7 @@ public struct ArgyllRunner: Sendable {
             args = try ChartreadArgs.build(config: config)
         } catch {
             return AsyncStream { continuation in
-                continuation.yield(.failed(ArgyllRunnerError.chartreadFailed(error.localizedDescription)))
+                continuation.yield(.failed(ArgyllRunnerError.toolFailed(tool: "chartread", code: -1, logs: [error.localizedDescription])))
                 continuation.finish()
             }
         }
@@ -637,7 +604,7 @@ public struct ArgyllRunner: Sendable {
                         workingDirectory: cwd
                     )
                 } catch {
-                    continuation.yield(.failed(ArgyllRunnerError.chartreadFailed(error.localizedDescription)))
+                    continuation.yield(.failed(ArgyllRunnerError.toolFailed(tool: "chartread", code: -1, logs: [error.localizedDescription])))
                     continuation.finish()
                     return
                 }
@@ -724,7 +691,11 @@ public struct ArgyllRunner: Sendable {
                         continuation.yield(.failed(ArgyllRunnerError.missingArtefact(canonical.path)))
                     }
                 } else {
-                    continuation.yield(.failed(ArgyllRunnerError.chartreadFailed("chartread exited with code \(exitCode ?? -1)")))
+                    continuation.yield(.failed(ArgyllRunnerError.toolFailed(
+                        tool: "chartread",
+                        code: exitCode ?? -1,
+                        logs: ["chartread exited with code \(exitCode ?? -1)"]
+                    )))
                 }
                 continuation.finish()
             }
@@ -768,30 +739,19 @@ public struct ArgyllRunner: Sendable {
     ) async throws -> URL {
         let args = try CalibrationTargenArgs.build(config: config)
         let cwd = PathSecurity.resolveSafeCwd(config.workingDirectory)
-        let calBasename = config.basename.hasPrefix("CAL_") ? config.basename : "CAL_\(config.basename)"
-        let cleanBasename = try PathSecurity.sanitizeBasename(calBasename)
-        let binaryURL = binaryResolver.resolve("targen")
-        let processId = ProcessID.targen(cleanBasename)
-
-        await ensureNotRunning(id: processId)
-        let events = processManager.events()
-        try await processManager.runStreaming(
-            id: processId,
-            binary: binaryURL,
-            arguments: args,
-            workingDirectory: cwd
+        let cleanBasename = try PathSecurity.sanitizeBasename(
+            CalibrationIdentity.prefix(config.basename)
+        )
+        let processId = ProcessID.targen(cleanBasename)
+        _ = try await runStreamingTool(
+            name: "targen",
+            id: processId,
+            arguments: args,
+            workingDirectory: cwd,
+            onLogBatch: onLogBatch
         )
-        let run = await collect(id: processId, events: events, onLogBatch: onLogBatch)
-
-        guard run.exitCode == 0 else {
-            throw ArgyllRunnerError.processFailed(code: run.exitCode ?? -1, logs: run.lines)
-        }
-
         let ti1URL = cwd.appendingPathComponent("\(cleanBasename).ti1")
-        guard FileManager.default.fileExists(atPath: ti1URL.path) else {
-            throw ArgyllRunnerError.missingArtefact(ti1URL.path)
-        }
-        return ti1URL
+        return try requireArtefact(ti1URL)
     }
 
     /// Computes a `.cal` curve from a measured `CAL_*.ti3`.
@@ -805,7 +765,7 @@ public struct ArgyllRunner: Sendable {
         let args = try PrintcalArgs.build(config: config)
         let cwd = PathSecurity.resolveSafeCwd(config.workingDirectory)
         let binaryURL = binaryResolver.resolve("printcal")
-        let calBasename = config.ti3Basename.hasPrefix("CAL_") ? config.ti3Basename : "CAL_\(config.ti3Basename)"
+        let calBasename = CalibrationIdentity.prefix(config.ti3Basename)
         let processId = ProcessID.printcal(calBasename)
 
         await ensureNotRunning(id: processId)
@@ -821,10 +781,12 @@ public struct ArgyllRunner: Sendable {
         }
 
         guard result.exitCode == 0 else {
-            throw ArgyllRunnerError.printcalFailed(
-                result.stderr.isEmpty
+            throw ArgyllRunnerError.toolFailed(
+                tool: "printcal",
+                code: result.exitCode,
+                logs: [result.stderr.isEmpty
                     ? "printcal exited with code \(result.exitCode)"
-                    : result.stderr
+                    : result.stderr]
             )
         }
 
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/PrinttargArgs.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/PrinttargArgs.swift
index bd4280c..2d6c08b 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/PrinttargArgs.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Argyll/PrinttargArgs.swift
@@ -69,7 +69,7 @@ public enum PrinttargArgs {
         }
         args.append(contentsOf: [config.bitDepth.flag, "\(config.dpi)"])
 
-        if !cleanBasename.hasPrefix("CAL_"),
+        if !CalibrationIdentity.isCalibration(cleanBasename),
            let cal = config.calibrationFile?.trimmingCharacters(in: .whitespacesAndNewlines),
            !cal.isEmpty {
             args.append(contentsOf: [config.calibrationEmbedOnly ? "-I" : "-K", cal])
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Files/ArtefactProbe.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Files/ArtefactProbe.swift
index 2affd02..9bb9777 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Files/ArtefactProbe.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Files/ArtefactProbe.swift
@@ -78,6 +78,18 @@ public enum ArtefactProbe {
         return nil
     }
 
+    /// Resolve an explicit profile URL, flipping `.icc` ↔ `.icm` when the
+    /// requested path is missing (#69 / issue #83).
+    public static func resolveProfile(
+        _ url: URL,
+        fileManager: FileManager = .default
+    ) -> URL {
+        if fileManager.fileExists(atPath: url.path) { return url }
+        let altExt = url.pathExtension.lowercased() == "icc" ? "icm" : "icc"
+        let alt = url.deletingPathExtension().appendingPathExtension(altExt)
+        return fileManager.fileExists(atPath: alt.path) ? alt : url
+    }
+
     /// Default extension for a *new* profile on macOS (#69).
     public static let defaultProfileExtension = "icc"
 
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Files/JSONFileStore.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Files/JSONFileStore.swift
new file mode 100644
index 0000000..3da31f3
--- /dev/null
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Files/JSONFileStore.swift
@@ -0,0 +1,84 @@
+import Foundation
+
+/// Policy when a JSON file exists but cannot be decoded.
+public enum JSONCorruptPolicy: Sendable {
+    /// Return `defaultValue` and leave the file untouched.
+    case replaceWithDefault
+    /// Throw the decode error. Callers must not overwrite the file.
+    case throwCorrupt
+}
+
+/// Shared pretty-printed JSON file façade used by settings, wizard state,
+/// and verification history.
+public struct JSONFileStore<T: Codable & Sendable>: Sendable {
+    public let fileURL: URL
+    public let corrupt: JSONCorruptPolicy
+    private let defaultValue: @Sendable () -> T
+    private let encoder: JSONEncoder
+    private let decoder: JSONDecoder
+
+    public init(
+        fileURL: URL,
+        corrupt: JSONCorruptPolicy,
+        defaultValue: @escaping @Sendable () -> T,
+        dateEncoding: JSONEncoder.DateEncodingStrategy = .deferredToDate,
+        dateDecoding: JSONDecoder.DateDecodingStrategy = .deferredToDate
+    ) {
+        self.fileURL = fileURL
+        self.corrupt = corrupt
+        self.defaultValue = defaultValue
+        let encoder = JSONEncoder()
+        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
+        encoder.dateEncodingStrategy = dateEncoding
+        self.encoder = encoder
+        let decoder = JSONDecoder()
+        decoder.dateDecodingStrategy = dateDecoding
+        self.decoder = decoder
+    }
+
+    /// Encodes `value` with the shared pretty / sorted-keys encoder.
+    public func encodePretty(_ value: T) throws -> Data {
+        try encoder.encode(value)
+    }
+
+    public func load() throws -> T {
+        let fm = FileManager.default
+        guard fm.fileExists(atPath: fileURL.path) else {
+            return defaultValue()
+        }
+        let data: Data
+        do {
+            data = try Data(contentsOf: fileURL)
+        } catch {
+            switch corrupt {
+            case .replaceWithDefault:
+                return defaultValue()
+            case .throwCorrupt:
+                throw error
+            }
+        }
+        do {
+            return try decoder.decode(T.self, from: data)
+        } catch {
+            switch corrupt {
+            case .replaceWithDefault:
+                return defaultValue()
+            case .throwCorrupt:
+                throw error
+            }
+        }
+    }
+
+    public func save(_ value: T) throws {
+        try AtomicFileWriter.write(try encodePretty(value), to: fileURL)
+    }
+}
+
+extension JSONEncoder {
+    /// Pretty-printed, sorted-keys encoder used by preset export.
+    public static func icceryPretty() -> JSONEncoder {
+        let encoder = JSONEncoder()
+        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
+        return encoder
+    }
+}
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/ChartreadRow.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/ChartreadRow.swift
index d9b7692..6bfd766 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/ChartreadRow.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/ChartreadRow.swift
@@ -51,58 +51,6 @@ public struct PatchColor: Codable, Sendable, Equatable {
     }
 }
 
-public struct CIEXYZ: Codable, Sendable, Equatable {
-    public let x: Double
-    public let y: Double
-    public let z: Double
-
-    public init(from decoder: Decoder) throws {
-        var container = try decoder.unkeyedContainer()
-        self.x = try container.decode(Double.self)
-        self.y = try container.decode(Double.self)
-        self.z = try container.decode(Double.self)
-    }
-
-    public init(x: Double, y: Double, z: Double) {
-        self.x = x
-        self.y = y
-        self.z = z
-    }
-
-    public func encode(to encoder: Encoder) throws {
-        var container = encoder.unkeyedContainer()
-        try container.encode(x)
-        try container.encode(y)
-        try container.encode(z)
-    }
-}
-
-public struct CIELab: Codable, Sendable, Equatable {
-    public let l: Double
-    public let a: Double
-    public let b: Double
-
-    public init(from decoder: Decoder) throws {
-        var container = try decoder.unkeyedContainer()
-        self.l = try container.decode(Double.self)
-        self.a = try container.decode(Double.self)
-        self.b = try container.decode(Double.self)
-    }
-
-    public init(l: Double, a: Double, b: Double) {
-        self.l = l
-        self.a = a
-        self.b = b
-    }
-
-    public func encode(to encoder: Encoder) throws {
-        var container = encoder.unkeyedContainer()
-        try container.encode(l)
-        try container.encode(a)
-        try container.encode(b)
-    }
-}
-
 public struct SpectralData: Codable, Sendable, Equatable {
     public let bands: Int
     public let startNM: Double
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/ColorDifference.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/ColorDifference.swift
index 02cf8b4..4ac782b 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/ColorDifference.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/ColorDifference.swift
@@ -154,11 +154,9 @@ public enum ColorDifference {
 
     /// Resolve a Lab from a `PatchColor`, computing it from XYZ when Lab is absent.
     public static func resolveLab(_ color: PatchColor) -> LabColor? {
-        if let lab = color.lab {
-            return LabColor(l: lab.l, a: lab.a, b: lab.b)
-        }
+        if let lab = color.lab { return lab }
         guard let xyz = color.xyz else { return nil }
-        return LabColorMath.xyzToLab(XYZColor(x: xyz.x, y: xyz.y, z: xyz.z))
+        return LabColorMath.xyzToLab(xyz)
     }
 
     private static func atan2ToDegrees(_ y: Double, _ x: Double) -> Double {
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/LabColor.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/LabColor.swift
index cd7a427..c795b30 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/LabColor.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Measurement/LabColor.swift
@@ -1,7 +1,8 @@
 import Foundation
 
 /// XYZ tristimulus values, stored in the 0–100 scale used by the Argyll fork.
-public struct XYZColor: Sendable, Equatable {
+/// Unkeyed Codable matches `ROW_COLORS_JSON` `[x, y, z]`.
+public struct XYZColor: Codable, Sendable, Equatable {
     public let x: Double
     public let y: Double
     public let z: Double
@@ -11,10 +12,24 @@ public struct XYZColor: Sendable, Equatable {
         self.y = y
         self.z = z
     }
+
+    public init(from decoder: Decoder) throws {
+        var container = try decoder.unkeyedContainer()
+        self.x = try container.decode(Double.self)
+        self.y = try container.decode(Double.self)
+        self.z = try container.decode(Double.self)
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.unkeyedContainer()
+        try container.encode(x)
+        try container.encode(y)
+        try container.encode(z)
+    }
 }
 
-/// CIELab value (D50).
-public struct LabColor: Sendable, Equatable {
+/// CIELab value (D50). Unkeyed Codable matches `ROW_COLORS_JSON` `[L, a, b]`.
+public struct LabColor: Codable, Sendable, Equatable {
     public let l: Double
     public let a: Double
     public let b: Double
@@ -24,8 +39,26 @@ public struct LabColor: Sendable, Equatable {
         self.a = a
         self.b = b
     }
+
+    public init(from decoder: Decoder) throws {
+        var container = try decoder.unkeyedContainer()
+        self.l = try container.decode(Double.self)
+        self.a = try container.decode(Double.self)
+        self.b = try container.decode(Double.self)
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.unkeyedContainer()
+        try container.encode(l)
+        try container.encode(a)
+        try container.encode(b)
+    }
 }
 
+/// JSON aliases used by `chartread` row payloads.
+public typealias CIEXYZ = XYZColor
+public typealias CIELab = LabColor
+
 /// sRGB colour in 0–1 display space.
 public struct DisplayRGB: Sendable, Equatable {
     public let r: Double
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Process/ProcessManager.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Process/ProcessManager.swift
index 627bda6..0d7381b 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Process/ProcessManager.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Process/ProcessManager.swift
@@ -136,17 +136,14 @@ public actor ProcessManager {
     ) throws {
         guard !isRunning(id) else { throw ProcessError.duplicateID(id) }
 
-        let process = Process()
-        let stdinPipe = Pipe()
-        let stdoutPipe = Pipe()
-        let stderrPipe = Pipe()
-        process.executableURL = binary
-        process.arguments = arguments
-        process.currentDirectoryURL = workingDirectory
-        process.standardInput = stdinPipe
-        process.standardOutput = stdoutPipe
-        process.standardError = stderrPipe
-        process.environment = childEnvironment(extra: environment)
+        let prepared = makeProcess(
+            binary: binary,
+            arguments: arguments,
+            workingDirectory: workingDirectory,
+            environment: environment,
+            includeStdin: true
+        )
+        let process = prepared.process
 
         AppLogger(category: "process").debug(
             "spawn \(id): \(binary.path) \(LogSanitizer.sanitizeArgs(arguments))"
@@ -154,13 +151,13 @@ public actor ProcessManager {
 
         children[id] = RunningChild(
             process: process,
-            stdin: stdinPipe.fileHandleForWriting,
+            stdin: prepared.stdinPipe?.fileHandleForWriting,
             stdoutDecoder: ProcessLineDecoder(),
             stderrDecoder: ProcessLineDecoder()
         )
 
-        let stdoutHandle = stdoutPipe.fileHandleForReading
-        let stderrHandle = stderrPipe.fileHandleForReading
+        let stdoutHandle = prepared.stdoutPipe.fileHandleForReading
+        let stderrHandle = prepared.stderrPipe.fileHandleForReading
         stdoutHandle.readabilityHandler = { [weak self] handle in
             let data = handle.availableData
             guard let self else { return }
@@ -172,21 +169,13 @@ public actor ProcessManager {
             Task { await self.ingestOutput(data, id: id, isStderr: true, handle: handle) }
         }
 
-        process.terminationHandler = { [weak self] proc in
+        attachExitWatchdog(process) { [weak self] code in
             guard let self else { return }
-            Task { await self.didTerminate(id: id, code: proc.terminationStatus) }
+            Task { await self.didTerminate(id: id, code: code) }
         }
 
         do {
             try process.run()
-            // Fallback watchdog: very fast child exits can race past the
-            // terminationHandler delivery on a loaded host. waitUntilExit()
-            // blocks the detached thread and guarantees didTerminate runs.
-            Task.detached { [weak self, process] in
-                process.waitUntilExit()
-                guard let self else { return }
-                await self.didTerminate(id: id, code: process.terminationStatus)
-            }
         } catch {
             preKillHooks.removeValue(forKey: id)
             children.removeValue(forKey: id)
@@ -210,15 +199,16 @@ public actor ProcessManager {
     ) async throws -> CapturedResult {
         guard !isRunning(id) else { throw ProcessError.duplicateID(id) }
 
-        let process = Process()
-        let stdoutPipe = Pipe()
-        let stderrPipe = Pipe()
-        process.executableURL = binary
-        process.arguments = arguments
-        process.currentDirectoryURL = workingDirectory
-        process.standardOutput = stdoutPipe
-        process.standardError = stderrPipe
-        process.environment = childEnvironment(extra: environment)
+        let prepared = makeProcess(
+            binary: binary,
+            arguments: arguments,
+            workingDirectory: workingDirectory,
+            environment: environment,
+            includeStdin: false
+        )
+        let process = prepared.process
+        let stdoutPipe = prepared.stdoutPipe
+        let stderrPipe = prepared.stderrPipe
 
         AppLogger(category: "process").debug(
             "spawn(captured) \(id): \(binary.path) \(LogSanitizer.sanitizeArgs(arguments))"
@@ -275,20 +265,12 @@ public actor ProcessManager {
             }
         }
         let box = Box()
-        capturedProcess.terminationHandler = { proc in
-            _ = box.resume(with: proc.terminationStatus)
+        attachExitWatchdog(capturedProcess) { status in
+            _ = box.resume(with: status)
         }
 
         do {
             try process.run()
-            // Fallback watchdog: very fast child exits can race past the
-            // terminationHandler delivery on a loaded host. waitUntilExit()
-            // blocks the detached thread and resumes the box if the handler
-            // did not already do so (#50, #52).
-            Task.detached { [capturedProcess] in
-                capturedProcess.waitUntilExit()
-                _ = box.resume(with: capturedProcess.terminationStatus)
-            }
         } catch {
             _ = box.resume(with: -1)
             captured.removeValue(forKey: id)
@@ -371,12 +353,7 @@ public actor ProcessManager {
         guard var child = children[id], !child.finalized else { return }
 
         if let tail = child.stdoutDecoder.flushPartial() {
-            if tail.hasPrefix(Self.rowColorsPrefix) {
-                let payload = Data(tail.dropFirst(Self.rowColorsPrefix.count).utf8)
-                emit(.jsonRow(id: id, payload: payload))
-            } else {
-                emit(.stdout(id: id, line: tail))
-            }
+            emitStdoutLine(id: id, line: tail)
         }
         if let tail = child.stderrDecoder.flushPartial() {
             emit(.stderr(id: id, line: tail))
@@ -447,6 +424,65 @@ public actor ProcessManager {
 
     // MARK: - Internals
 
+    private struct PreparedProcess {
+        let process: Process
+        let stdinPipe: Pipe?
+        let stdoutPipe: Pipe
+        let stderrPipe: Pipe
+    }
+
+    private func makeProcess(
+        binary: URL,
+        arguments: [String],
+        workingDirectory: URL?,
+        environment: [String: String],
+        includeStdin: Bool
+    ) -> PreparedProcess {
+        let process = Process()
+        let stdoutPipe = Pipe()
+        let stderrPipe = Pipe()
+        let stdinPipe: Pipe? = includeStdin ? Pipe() : nil
+        process.executableURL = binary
+        process.arguments = arguments
+        process.currentDirectoryURL = workingDirectory
+        process.standardOutput = stdoutPipe
+        process.standardError = stderrPipe
+        if let stdinPipe {
+            process.standardInput = stdinPipe
+        }
+        process.environment = childEnvironment(extra: environment)
+        return PreparedProcess(
+            process: process,
+            stdinPipe: stdinPipe,
+            stdoutPipe: stdoutPipe,
+            stderrPipe: stderrPipe
+        )
+    }
+
+    /// terminationHandler can lose a fast-exit race on a loaded host;
+    /// `waitUntilExit` on a detached thread is the fallback (#50, #52).
+    private func attachExitWatchdog(
+        _ process: Process,
+        onExit: @escaping @Sendable (Int32) -> Void
+    ) {
+        process.terminationHandler = { proc in
+            onExit(proc.terminationStatus)
+        }
+        Task.detached { [process] in
+            process.waitUntilExit()
+            onExit(process.terminationStatus)
+        }
+    }
+
+    private func emitStdoutLine(id: String, line: String) {
+        if line.hasPrefix(Self.rowColorsPrefix) {
+            let payload = Data(line.dropFirst(Self.rowColorsPrefix.count).utf8)
+            emit(.jsonRow(id: id, payload: payload))
+        } else {
+            emit(.stdout(id: id, line: line))
+        }
+    }
+
     private func childEnvironment(extra: [String: String]) -> [String: String] {
         var env = ProcessInfo.processInfo.environment
         env["ARGYLL_NOT_INTERACTIVE"] = "1"
@@ -478,15 +514,14 @@ public actor ProcessManager {
 
         let log = AppLogger(category: "subprocess")
         for line in lines {
-            if !isStderr, line.hasPrefix(Self.rowColorsPrefix) {
-                let payload = Data(line.dropFirst(Self.rowColorsPrefix.count).utf8)
-                emit(.jsonRow(id: id, payload: payload))
-            } else if isStderr {
+            if !isStderr {
+                emitStdoutLine(id: id, line: line)
+                if !line.hasPrefix(Self.rowColorsPrefix) {
+                    log.info("[\(id)] \(line)")
+                }
+            } else {
                 log.warn("[\(id)] \(line)")
                 emit(.stderr(id: id, line: line))
-            } else {
-                log.info("[\(id)] \(line)")
-                emit(.stdout(id: id, line: line))
             }
         }
     }
@@ -528,11 +563,7 @@ public actor ProcessManager {
         // Flush unterminated tail lines.
         if var decoder = Optional(child.stdoutDecoder),
            let tail = decoder.finish() {
-            if tail.hasPrefix(Self.rowColorsPrefix) {
-                emit(.jsonRow(id: id, payload: Data(tail.dropFirst(Self.rowColorsPrefix.count).utf8)))
-            } else {
-                emit(.stdout(id: id, line: tail))
-            }
+            emitStdoutLine(id: id, line: tail)
         }
         if var decoder = Optional(child.stderrDecoder),
            let tail = decoder.finish() {
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/CalibrationIdentity.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/CalibrationIdentity.swift
new file mode 100644
index 0000000..ac24329
--- /dev/null
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/CalibrationIdentity.swift
@@ -0,0 +1,54 @@
+import Foundation
+
+/// Canonical `CAL_` / original-stem pairing for Stage 0 (issue #29 / #83).
+///
+/// The live wizard basename, the persisted `calibrationOriginalBasename`,
+/// and the runner all derive identity from this type. Do not add a second
+/// `hasPrefix("CAL_")` ternary elsewhere.
+public struct CalibrationIdentity: Equatable, Sendable {
+    /// Never has a `CAL_` prefix. Empty only when the live basename is empty.
+    public var originalBasename: String
+    /// Always `CAL_{original}` when original is non-empty.
+    public var calibrationBasename: String
+
+    public init(originalBasename: String, calibrationBasename: String) {
+        self.originalBasename = originalBasename
+        self.calibrationBasename = calibrationBasename
+    }
+
+    public static func isCalibration(_ basename: String) -> Bool {
+        basename.hasPrefix("CAL_")
+    }
+
+    /// The only place that adds a `CAL_` prefix.
+    public static func prefix(_ original: String) -> String {
+        if original.isEmpty { return original }
+        return original.hasPrefix("CAL_") ? original : "CAL_\(original)"
+    }
+
+    /// Strip a single leading `CAL_` if present.
+    public static func strip(_ basename: String) -> String {
+        basename.hasPrefix("CAL_") ? String(basename.dropFirst(4)) : basename
+    }
+
+    /// Derive identity from the live wizard basename and the persisted
+    /// original. A non-empty persisted original wins over a `CAL_` live
+    /// name (Force Quit mid-calibration).
+    public static func parse(liveBasename: String, persistedOriginal: String) -> CalibrationIdentity {
+        if liveBasename.isEmpty && persistedOriginal.isEmpty {
+            return CalibrationIdentity(originalBasename: "", calibrationBasename: "")
+        }
+        let original: String
+        if liveBasename.hasPrefix("CAL_") {
+            original = persistedOriginal.isEmpty ? strip(liveBasename) : persistedOriginal
+        } else if liveBasename.isEmpty {
+            original = persistedOriginal
+        } else {
+            original = liveBasename
+        }
+        return CalibrationIdentity(
+            originalBasename: original,
+            calibrationBasename: prefix(original)
+        )
+    }
+}
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/CalibrationTargenArgs.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/CalibrationTargenArgs.swift
index bccaa02..e5d4b4a 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/CalibrationTargenArgs.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/CalibrationTargenArgs.swift
@@ -86,7 +86,7 @@ public enum CalibrationTargenArgs {
             args.append(contentsOf: ["-l", "\(inkLimit)"])
         }
 
-        let calBasename = cleanBasename.hasPrefix("CAL_") ? cleanBasename : "CAL_\(cleanBasename)"
+        let calBasename = CalibrationIdentity.prefix(cleanBasename)
         args.append(calBasename)
         return args
     }
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/ColprofArgs.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/ColprofArgs.swift
index 05d4566..ba01450 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/ColprofArgs.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/ColprofArgs.swift
@@ -26,18 +26,13 @@ public enum ColprofArgs {
         let cleanBasename = try PathSecurity.sanitizeBasename(config.basename)
 
         var args: [String] = ["-v"]
-
         args.append(contentsOf: ["-a", config.algorithm])
         args.append(contentsOf: ["-q", config.quality])
-
-        if let intent = config.intent?.trimmingCharacters(in: .whitespaces), !intent.isEmpty {
-            args.append(contentsOf: ["-t", intent])
-        }
+        args.append(contentsOf: ArgsBuilder.optionIfNonEmpty("-t", config.intent))
 
         if let fwa = config.fwa?.trimmingCharacters(in: .whitespaces) {
             switch fwa.lowercased() {
             case "none", "":
-                // "none" omits the flag; an explicit empty string means bare -f.
                 if fwa.isEmpty {
                     args.append("-f")
                 }
@@ -46,32 +41,20 @@ public enum ColprofArgs {
             }
         }
 
-        if let illuminant = config.illuminant?.trimmingCharacters(in: .whitespaces), !illuminant.isEmpty {
-            args.append(contentsOf: ["-i", illuminant])
-        }
-
-        if let observer = config.observer?.trimmingCharacters(in: .whitespaces), !observer.isEmpty {
-            args.append(contentsOf: ["-o", observer])
-        }
+        args.append(contentsOf: ArgsBuilder.optionIfNonEmpty("-i", config.illuminant))
+        args.append(contentsOf: ArgsBuilder.optionIfNonEmpty("-o", config.observer))
 
         if let inputCond = config.inputViewingCond?.trimmingCharacters(in: .whitespaces),
            !inputCond.isEmpty, inputCond.lowercased() != "none" {
             args.append(contentsOf: ["-c", inputCond])
         }
-
         if let outputCond = config.outputViewingCond?.trimmingCharacters(in: .whitespaces),
            !outputCond.isEmpty, outputCond.lowercased() != "none" {
             args.append(contentsOf: ["-d", outputCond])
         }
 
-        let profileDescription = config.description?.trimmingCharacters(in: .whitespaces)
-        if let description = profileDescription, !description.isEmpty {
-            args.append(contentsOf: ["-D", description])
-        }
-
-        if let copyright = config.copyright?.trimmingCharacters(in: .whitespaces), !copyright.isEmpty {
-            args.append(contentsOf: ["-C", copyright])
-        }
+        args.append(contentsOf: ArgsBuilder.optionIfNonEmpty("-D", config.description))
+        args.append(contentsOf: ArgsBuilder.optionIfNonEmpty("-C", config.copyright))
 
         args.append(cleanBasename)
         return args
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/PrintcalArgs.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/PrintcalArgs.swift
index bdee5e2..6c8c5fa 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/PrintcalArgs.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/PrintcalArgs.swift
@@ -107,7 +107,7 @@ public enum PrintcalArgs {
         }
         args.append(contentsOf: ["-o", config.outputURL.path])
 
-        let calBasename = cleanBasename.hasPrefix("CAL_") ? cleanBasename : "CAL_\(cleanBasename)"
+        let calBasename = CalibrationIdentity.prefix(cleanBasename)
         args.append(calBasename)
         return args
     }
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/VerificationHistoryStore.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/VerificationHistoryStore.swift
index 2910aca..fea54c9 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Profile/VerificationHistoryStore.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Profile/VerificationHistoryStore.swift
@@ -13,8 +13,7 @@ public actor VerificationHistoryStore {
     private var records: [VerificationRecord] = []
 
     private let capacity: Int
-    private let encoder: JSONEncoder
-    private let decoder: JSONDecoder
+    private let fileStore: JSONFileStore<[VerificationRecord]>
 
     public init(
         url: URL = AppPaths.appDataDir.appendingPathComponent("verification_history.json"),
@@ -22,13 +21,13 @@ public actor VerificationHistoryStore {
     ) {
         self.url = url
         self.capacity = capacity
-
-        self.encoder = JSONEncoder()
-        self.encoder.dateEncodingStrategy = .iso8601
-        self.encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
-
-        self.decoder = JSONDecoder()
-        self.decoder.dateDecodingStrategy = .iso8601
+        self.fileStore = JSONFileStore(
+            fileURL: url,
+            corrupt: .throwCorrupt,
+            defaultValue: { [] },
+            dateEncoding: .iso8601,
+            dateDecoding: .iso8601
+        )
     }
 
     /// Loads records from disk. Returns the existing cache if already loaded.
@@ -37,10 +36,8 @@ public actor VerificationHistoryStore {
     /// is never overwritten in that case.
     public func load() throws -> [VerificationRecord] {
         guard records.isEmpty else { return records }
-        let fm = FileManager.default
-        guard fm.fileExists(atPath: url.path),
-              let data = try? Data(contentsOf: url) else { return [] }
-        records = try decoder.decode([VerificationRecord].self, from: data)
+        guard FileManager.default.fileExists(atPath: url.path) else { return [] }
+        records = try fileStore.load()
         return records
     }
 
@@ -106,8 +103,7 @@ public actor VerificationHistoryStore {
 
     /// Writes `records` through a temp file and rename.
     private func write(_ records: [VerificationRecord]) throws {
-        let data = try encoder.encode(records)
-        try AtomicFileWriter.write(data, to: url)
+        try fileStore.save(records)
     }
 
     private func csvRow(_ fields: [String]) -> String {
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Settings/PresetMapping.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Settings/PresetMapping.swift
new file mode 100644
index 0000000..f7f36dc
--- /dev/null
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Settings/PresetMapping.swift
@@ -0,0 +1,178 @@
+import Foundation
+
+extension TargenConfig {
+    /// Stage 1 fields of a profiling preset. Optional advanced flags stay
+    /// `nil` when the preset omitted them so argv builders skip the flag.
+    public init(preset: ProfilingPreset, basename: String, workingDirectory: URL?) {
+        self.init(
+            colourSpace: preset.colourSpace.lowercased() == "cmyk" ? .cmyk : .rgb,
+            patchCount: preset.patchCount,
+            whitePatches: preset.whitePatches,
+            blackPatches: preset.blackPatches,
+            greySteps: preset.greySteps,
+            singleChannelSteps: preset.singleChannelSteps,
+            neutralSteps: preset.neutralSteps,
+            neutralConcentration: preset.neutralConcentration,
+            preconditioningProfile: preset.preconditioningProfile,
+            ofpsHighQuality: preset.ofpsHighQuality == true ? true : nil,
+            ofpsAdaptation: preset.ofpsAdaptation,
+            fullSpreadAlgorithm: preset.fullSpreadAlgorithm.flatMap { FullSpreadAlgorithm(presetValue: $0) }.flatMap { $0 == .ofps ? nil : $0 },
+            totalInkLimit: preset.totalInkLimit,
+            darkEmphasis: preset.darkEmphasis,
+            devicePower: preset.devicePower,
+            basename: basename,
+            workingDirectory: workingDirectory
+        )
+    }
+}
+
+extension PrinttargConfig {
+    public init(
+        preset: ProfilingPreset,
+        basename: String,
+        workingDirectory: URL?,
+        calibrationFile: String?,
+        label: String? = nil
+    ) {
+        let page: PageSize
+        let customW: Double
+        let customH: Double
+        if let size = PageSize(rawValue: preset.pageSize) {
+            page = size
+            customW = 210
+            customH = 297
+        } else if let (w, h) = PageSize.parseCustom(preset.pageSize) {
+            page = .custom
+            customW = w
+            customH = h
+        } else {
+            page = .a4
+            customW = 210
+            customH = 297
+        }
+
+        let layout: LayoutOrder
+        let seed = preset.randomSeed ?? 1
+        if preset.noRandomize == true {
+            layout = .raster
+        } else if seed == 1 {
+            layout = .deterministic
+        } else {
+            layout = .customSeed
+        }
+
+        self.init(
+            instrument: PrintInstrument(rawValue: preset.instrument) ?? .i1,
+            pageSize: page,
+            customPageWidth: customW,
+            customPageHeight: customH,
+            bitDepth: preset.bitDepth == 16 ? .sixteen : .eight,
+            dpi: preset.dpi,
+            layoutOrder: layout,
+            customSeed: seed,
+            label: label,
+            calibrationFile: calibrationFile,
+            calibrationEmbedOnly: false,
+            basename: basename,
+            workingDirectory: workingDirectory
+        )
+    }
+}
+
+extension ColprofConfig {
+    public init(
+        preset: ProfilingPreset,
+        basename: String,
+        workingDirectory: URL?,
+        description: String? = nil,
+        copyright: String? = nil
+    ) {
+        self.init(
+            algorithm: preset.colprofAlgorithm ?? "l",
+            quality: preset.colprofQuality ?? "m",
+            intent: Self.nilIfEmpty(preset.colprofIntent),
+            fwa: preset.colprofFwa,
+            illuminant: Self.nilIfEmpty(preset.colprofIlluminant),
+            observer: Self.nilIfEmpty(preset.colprofObserver),
+            inputViewingCond: Self.nilIfEmpty(preset.colprofInputViewingCond),
+            outputViewingCond: Self.nilIfEmpty(preset.colprofOutputViewingCond),
+            description: description,
+            copyright: copyright,
+            basename: basename,
+            workingDirectory: workingDirectory
+        )
+    }
+
+    private static func nilIfEmpty(_ value: String?) -> String? {
+        guard let value, !value.isEmpty else { return nil }
+        return value
+    }
+}
+
+extension PageSize {
+    /// `"210x297"` custom page parse used by presets (issue #82).
+    public static func parseCustom(_ raw: String) -> (Double, Double)? {
+        let parts = raw.lowercased().split(separator: "x")
+        guard parts.count == 2,
+              let w = Double(parts[0]), let h = Double(parts[1]),
+              w >= 50, h >= 50 else { return nil }
+        return (w, h)
+    }
+}
+
+extension ProfilingPreset {
+    /// Snapshot of the three live configs plus calibration toggles.
+    public init(
+        id: String,
+        name: String,
+        description: String,
+        targen: TargenConfig,
+        printtarg: PrinttargConfig,
+        colprof: ColprofConfig,
+        calibrationFile: String?,
+        applyCalibration: Bool?
+    ) {
+        let pageSize: String
+        if printtarg.pageSize == .custom {
+            pageSize = "\(Int(printtarg.customPageWidth))x\(Int(printtarg.customPageHeight))"
+        } else {
+            pageSize = printtarg.pageSize.rawValue
+        }
+        self.init(
+            id: id,
+            name: name,
+            description: description,
+            colourSpace: targen.colourSpace == .cmyk ? "cmyk" : "rgb",
+            patchCount: targen.patchCount,
+            whitePatches: targen.whitePatches,
+            blackPatches: targen.blackPatches,
+            greySteps: targen.greySteps,
+            singleChannelSteps: targen.singleChannelSteps,
+            neutralSteps: targen.neutralSteps,
+            neutralConcentration: targen.neutralConcentration,
+            preconditioningProfile: targen.preconditioningProfile,
+            ofpsHighQuality: targen.ofpsHighQuality,
+            ofpsAdaptation: targen.ofpsAdaptation,
+            fullSpreadAlgorithm: (targen.fullSpreadAlgorithm ?? .ofps).presetValue,
+            totalInkLimit: targen.totalInkLimit,
+            darkEmphasis: targen.darkEmphasis,
+            devicePower: targen.devicePower,
+            instrument: printtarg.instrument.rawValue,
+            pageSize: pageSize,
+            bitDepth: printtarg.bitDepth.rawValue,
+            dpi: printtarg.dpi,
+            randomSeed: printtarg.layoutOrder == .deterministic ? 1 : printtarg.customSeed,
+            noRandomize: printtarg.layoutOrder == .raster,
+            calibrationFile: calibrationFile,
+            applyCalibration: applyCalibration,
+            colprofAlgorithm: colprof.algorithm,
+            colprofQuality: colprof.quality,
+            colprofIntent: colprof.intent,
+            colprofFwa: colprof.fwa,
+            colprofIlluminant: colprof.illuminant,
+            colprofObserver: colprof.observer,
+            colprofInputViewingCond: colprof.inputViewingCond,
+            colprofOutputViewingCond: colprof.outputViewingCond
+        )
+    }
+}
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Settings/PresetStore.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Settings/PresetStore.swift
index eec99f3..b47d0b3 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Settings/PresetStore.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Settings/PresetStore.swift
@@ -60,9 +60,7 @@ public final class PresetStore: Sendable {
 
     /// Single-preset pretty JSON export.
     public func export(_ preset: ProfilingPreset) throws -> Data {
-        let encoder = JSONEncoder()
-        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
-        return try encoder.encode(preset)
+        return try JSONEncoder.icceryPretty().encode(preset)
     }
 
     /// Parses + validates a preset from JSON. The preset is assigned a
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Settings/SettingsStore.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Settings/SettingsStore.swift
index f4a679c..22bdca6 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Settings/SettingsStore.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Settings/SettingsStore.swift
@@ -4,8 +4,8 @@ import Foundation
 /// `~/Library/Application Support/com.gronod.iccery2/settings.json`
 /// (issue #5 — the v1 path is never read).
 ///
-/// Writes are atomic (`AtomicFileWriter`). Invalid/corrupt JSON falls
-/// back to defaults. Saving posts `settingsDidChange` so #20 can
+/// Writes are atomic (`JSONFileStore` → `AtomicFileWriter`). Invalid/corrupt
+/// JSON falls back to defaults. Saving posts `settingsDidChange` so #20 can
 /// reclassify swatches.
 public final class SettingsStore: Sendable {
 
@@ -14,18 +14,19 @@ public final class SettingsStore: Sendable {
         Notification.Name("com.gronod.iccery2.settingsDidChange")
 
     public let fileURL: URL
+    private let store: JSONFileStore<AppSettings>
 
     public init(fileURL: URL = AppPaths.appDataDir.appendingPathComponent("settings.json")) {
         self.fileURL = fileURL
+        self.store = JSONFileStore(
+            fileURL: fileURL,
+            corrupt: .replaceWithDefault,
+            defaultValue: { .default }
+        )
     }
 
     public func load() -> AppSettings {
-        guard let data = try? Data(contentsOf: fileURL),
-              let settings = try? JSONDecoder().decode(AppSettings.self, from: data)
-        else {
-            return .default
-        }
-        return settings
+        (try? store.load()) ?? .default
     }
 
     /// Validates before persisting — throws `SettingsError` listing
@@ -35,9 +36,7 @@ public final class SettingsStore: Sendable {
         guard errors.isEmpty else {
             throw SettingsError.validationFailed(errors)
         }
-        let encoder = JSONEncoder()
-        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
-        try AtomicFileWriter.write(encoder.encode(settings), to: fileURL)
+        try store.save(settings)
         NotificationCenter.default.post(name: Self.settingsDidChange, object: nil)
     }
 
diff --git a/Packages/ICCeryCore/Sources/ICCeryCore/Wizard/WizardState.swift b/Packages/ICCeryCore/Sources/ICCeryCore/Wizard/WizardState.swift
index e219f5e..b5fb31f 100644
--- a/Packages/ICCeryCore/Sources/ICCeryCore/Wizard/WizardState.swift
+++ b/Packages/ICCeryCore/Sources/ICCeryCore/Wizard/WizardState.swift
@@ -74,23 +74,24 @@ public struct WizardState: Codable, Equatable, Sendable {
 /// Atomic JSON persistence for `WizardState` (issue #4).
 public final class WizardStateStore: Sendable {
     public let fileURL: URL
+    private let store: JSONFileStore<WizardState>
 
     public init(
         fileURL: URL = AppPaths.appDataDir.appendingPathComponent("wizard_state.json")
     ) {
         self.fileURL = fileURL
+        self.store = JSONFileStore(
+            fileURL: fileURL,
+            corrupt: .replaceWithDefault,
+            defaultValue: { .default }
+        )
     }
 
     public func load() -> WizardState {
-        guard let data = try? Data(contentsOf: fileURL),
-              let state = try? JSONDecoder().decode(WizardState.self, from: data)
-        else { return .default }
-        return state
+        (try? store.load()) ?? .default
     }
 
     public func save(_ state: WizardState) throws {
-        let encoder = JSONEncoder()
-        encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
-        try AtomicFileWriter.write(encoder.encode(state), to: fileURL)
+        try store.save(state)
     }
 }
diff --git a/Sources/ICCery/CalibrationViewModel.swift b/Sources/ICCery/CalibrationViewModel.swift
index 8ed2f17..a327019 100644
--- a/Sources/ICCery/CalibrationViewModel.swift
+++ b/Sources/ICCery/CalibrationViewModel.swift
@@ -50,14 +50,15 @@ final class CalibrationViewModel {
         return cwd.appendingPathComponent("\(calBasename).ti3")
     }
 
-    private var calBasename: String {
-        if wizard.basename.hasPrefix("CAL_") { return wizard.basename }
-        let original = !wizard.calibrationOriginalBasename.isEmpty
-            ? wizard.calibrationOriginalBasename
-            : wizard.basename
-        return "CAL_\(original)"
+    private var identity: CalibrationIdentity {
+        CalibrationIdentity.parse(
+            liveBasename: wizard.basename,
+            persistedOriginal: wizard.calibrationOriginalBasename
+        )
     }
 
+    private var calBasename: String { identity.calibrationBasename }
+
     private var calOutputURL: URL? {
         guard let cwd = wizard.effectiveWorkingDirectory else { return nil }
         return cwd.appendingPathComponent("\(calBasename).cal")
@@ -68,13 +69,12 @@ final class CalibrationViewModel {
     func generateTarget() {
         guard canGenerate, let cwd = wizard.effectiveWorkingDirectory else { return }
         // Snapshot the original (pre-CAL_) basename before changing the live one.
-        if !wizard.basename.hasPrefix("CAL_") {
-            wizard.calibrationOriginalBasename = wizard.basename
-        } else if wizard.calibrationOriginalBasename.isEmpty {
-            wizard.calibrationOriginalBasename = String(wizard.basename.dropFirst(4))
-        }
-        let original = wizard.calibrationOriginalBasename
-        wizard.basename = "CAL_\(original)"
+        let identity = CalibrationIdentity.parse(
+            liveBasename: wizard.basename,
+            persistedOriginal: wizard.calibrationOriginalBasename
+        )
+        wizard.calibrationOriginalBasename = identity.originalBasename
+        wizard.basename = identity.calibrationBasename
         wizard.sessionMode = .calibration
 
         isGenerating = true
@@ -87,7 +87,7 @@ final class CalibrationViewModel {
             whitePatches: whitePatches,
             includeNeutralEmphasis: includeNeutralEmphasis,
             inkLimit: inkLimitValue,
-            basename: original,
+            basename: identity.originalBasename,
             workingDirectory: cwd
         )
 
@@ -95,11 +95,9 @@ final class CalibrationViewModel {
             defer { self.isGenerating = false }
 
             do {
-                _ = try await self.environment.runner.runCalibrationTargen(config: config) { batch in
-                    Task { @MainActor [weak self] in
-                        self?.calibrationLog.append(contentsOf: batch)
-                    }
-                }
+                _ = try await self.environment.runner.runCalibrationTargen(config: config, onLogBatch: ProcessRunSupport.logSink { [weak self] batch in
+                    self?.calibrationLog.append(contentsOf: batch)
+                })
                 self.wizard.refreshGating()
                 self.wizard.showNotice("Calibration target generated.")
                 self.wizard.go(to: .layOutPrint)
@@ -163,11 +161,9 @@ final class CalibrationViewModel {
             defer { self.isComputing = false }
 
             do {
-                let url = try await self.environment.runner.runPrintcal(config: config) { batch in
-                    Task { @MainActor [weak self] in
-                        self?.calibrationLog.append(contentsOf: batch)
-                    }
-                }
+                let url = try await self.environment.runner.runPrintcal(config: config, onLogBatch: ProcessRunSupport.logSink { [weak self] batch in
+                    self?.calibrationLog.append(contentsOf: batch)
+                })
                 self.computedCalURL = url
                 self.profile.calibrationFile = url.path
                 self.profile.applyCalibration = self.applyToProfile
diff --git a/Sources/ICCery/FileDialogService.swift b/Sources/ICCery/FileDialogService.swift
index 13e7c0c..5852e93 100644
--- a/Sources/ICCery/FileDialogService.swift
+++ b/Sources/ICCery/FileDialogService.swift
@@ -29,13 +29,8 @@ final class FileDialogService {
 
     /// `selectTargetFile` — **save** panel for the new `.ti1` target.
     func selectTargetFile(startingAt start: URL? = nil) -> URL? {
-        let panel = NSSavePanel()
-        panel.nameFieldStringValue = "target.ti1"
-        panel.allowedContentTypes = utTypes(["ti1"])
-        panel.allowsOtherFileTypes = false
-        panel.directoryURL = start
-        panel.message = "Choose the .ti1 target file to create"
-        return run(panel)
+        save(named: "target.ti1", extensions: ["ti1"], startingAt: start,
+             message: "Choose the .ti1 target file to create")
     }
 
     /// `selectExistingTarget` — open `.ti1`/`.ti2` (docs/06 §Resume, #140).
@@ -66,12 +61,7 @@ final class FileDialogService {
 
     /// `selectCsvSavePath` — verification-history CSV export.
     func selectCsvSavePath(startingAt start: URL? = nil) -> URL? {
-        let panel = NSSavePanel()
-        panel.nameFieldStringValue = "verification-history.csv"
-        panel.allowedContentTypes = utTypes(["csv"])
-        panel.allowsOtherFileTypes = false
-        panel.directoryURL = start
-        return run(panel)
+        save(named: "verification-history.csv", extensions: ["csv"], startingAt: start)
     }
 
     /// `selectCalFile` — `.cal` calibration curves.
@@ -88,17 +78,27 @@ final class FileDialogService {
 
     /// `btnExportActivePreset` — save a `.json` preset file.
     func selectPresetSavePath(name: String, startingAt start: URL? = nil) -> URL? {
-        let panel = NSSavePanel()
-        panel.nameFieldStringValue = "\(name).json"
-        panel.allowedContentTypes = utTypes(["json"])
-        panel.allowsOtherFileTypes = false
-        panel.directoryURL = start
-        panel.message = "Export this preset as JSON"
-        return run(panel)
+        save(named: "\(name).json", extensions: ["json"], startingAt: start,
+             message: "Export this preset as JSON")
     }
 
     // MARK: - Internals (private — not a shared public picker API)
 
+    private func save(
+        named: String,
+        extensions: [String],
+        startingAt start: URL?,
+        message: String? = nil
+    ) -> URL? {
+        let panel = NSSavePanel()
+        panel.nameFieldStringValue = named
+        panel.allowedContentTypes = utTypes(extensions)
+        panel.allowsOtherFileTypes = false
+        panel.directoryURL = start
+        if let message { panel.message = message }
+        return run(panel)
+    }
+
     private func open(
         extensions: [String],
         startingAt start: URL?,
diff --git a/Sources/ICCery/MeasurementWorkflowViewModel.swift b/Sources/ICCery/MeasurementWorkflowViewModel.swift
index 541608d..688ae3a 100644
--- a/Sources/ICCery/MeasurementWorkflowViewModel.swift
+++ b/Sources/ICCery/MeasurementWorkflowViewModel.swift
@@ -70,8 +70,7 @@ final class MeasurementWorkflowViewModel {
 
     var passSnapshots: [URL] = []
     var isFinishing = false
-    var finishNotice: String?
-    var finishNoticeIsError = false
+    var finishNotice: Notice?
     var resumedFromTi2 = false
 
     init(wizard: WizardViewModel, environment: AppEnvironment) {
@@ -400,7 +399,6 @@ final class MeasurementWorkflowViewModel {
         guard !isFinishing, let cwd = workingDirectory, !passSnapshots.isEmpty else { return }
         isFinishing = true
         finishNotice = nil
-        finishNoticeIsError = false
 
         Task { @MainActor [weak self] in
             guard let self else { return }
@@ -420,10 +418,8 @@ final class MeasurementWorkflowViewModel {
                     )
                     canonical = try await self.environment.runner.runAverage(
                         config: config,
-                        onLogBatch: { [weak self] batch in
-                            Task { @MainActor [weak self] in
-                                self?.chartreadLog.append(contentsOf: batch)
-                            }
+                        onLogBatch: ProcessRunSupport.logSink { [weak self] batch in
+                            self?.chartreadLog.append(contentsOf: batch)
                         }
                     )
                 }
@@ -432,7 +428,11 @@ final class MeasurementWorkflowViewModel {
                 if self.wizard.isUnlocked(.buildProfile) {
                     self.wizard.go(to: .buildProfile)
                 } else {
-                    self.finishNotice = "Finished: \(canonical.lastPathComponent) ready."
+                    self.finishNotice = Notice(
+                        kind: .info,
+                        text: "Finished: \(canonical.lastPathComponent) ready.",
+                        autoHideAfter: nil
+                    )
                 }
             } catch {
                 // Fallback to pass 1 promotion if averaging failed.
@@ -445,15 +445,24 @@ final class MeasurementWorkflowViewModel {
                         )
                         self.discoverPassSnapshots()
                         self.wizard.refreshGating()
-                        self.finishNotice = "Averaging failed — promoted first pass."
-                        self.finishNoticeIsError = true
+                        self.finishNotice = Notice(
+                            kind: .error,
+                            text: "Averaging failed — promoted first pass.",
+                            autoHideAfter: nil
+                        )
                     } catch {
-                        self.finishNotice = "Finish failed: \(error.localizedDescription)"
-                        self.finishNoticeIsError = true
+                        self.finishNotice = Notice(
+                            kind: .error,
+                            text: "Finish failed: \(error.localizedDescription)",
+                            autoHideAfter: nil
+                        )
                     }
                 } else {
-                    self.finishNotice = "Finish failed: \(error.localizedDescription)"
-                    self.finishNoticeIsError = true
+                    self.finishNotice = Notice(
+                        kind: .error,
+                        text: "Finish failed: \(error.localizedDescription)",
+                        autoHideAfter: nil
+                    )
                 }
             }
             self.isFinishing = false
diff --git a/Sources/ICCery/Print/PrintSessionViewModel.swift b/Sources/ICCery/Print/PrintSessionViewModel.swift
new file mode 100644
index 0000000..b35cf99
--- /dev/null
+++ b/Sources/ICCery/Print/PrintSessionViewModel.swift
@@ -0,0 +1,181 @@
+import Foundation
+import Observation
+import ICCeryCore
+
+/// CUPS queue selection, bound print panel, and `lp` spool (issues 12–15, 17 / #85).
+@MainActor
+@Observable
+final class PrintSessionViewModel {
+    let wizard: WizardViewModel
+    let environment: AppEnvironment
+
+    var printers: [Printer] = []
+    var selectedPrinter = ""
+    var printerCaps = PrinterCapabilities()
+    var selectedTray: Int?
+    var selectedMediaType: String?
+    var printOrientation = "portrait"
+    var capturedCupsOptions: [String: String] = [:]
+    var printNotice: Notice?
+    var isPrinting = false
+    private var printTask: Task<Void, Never>?
+
+    init(wizard: WizardViewModel, environment: AppEnvironment) {
+        self.wizard = wizard
+        self.environment = environment
+    }
+
+    func refreshPrinters() {
+        let cups = environment.cupsService
+        Task { @MainActor in
+            do {
+                let list = try await cups.listPrinters()
+                printers = list
+                if !list.contains(where: { $0.name == selectedPrinter }) {
+                    selectedPrinter = list.first { $0.isDefault }?.name
+                        ?? list.first?.name ?? ""
+                }
+                await reloadSelectedCapabilities()
+            } catch {
+                printNotice = Notice(
+                    kind: .error,
+                    text: "Could not list printers: \(error.localizedDescription)"
+                )
+            }
+        }
+    }
+
+    func reloadSelectedCapabilities() async {
+        guard !selectedPrinter.isEmpty else {
+            printerCaps = PrinterCapabilities()
+            return
+        }
+        do {
+            printerCaps = try await environment.cupsService
+                .capabilities(for: selectedPrinter)
+            if selectedMediaType == nil {
+                selectedMediaType = printerCaps.mediaTypes.first?.id
+            }
+            if selectedTray == nil {
+                selectedTray = printerCaps.trays.first?.id
+            }
+        } catch {
+            printerCaps = PrinterCapabilities()
+        }
+    }
+
+    func openPrinterPreferences() {
+        guard !selectedPrinter.isEmpty else { return }
+        let queue = selectedPrinter
+        let displayName = printers.first { $0.name == queue }?.displayName
+        let cups = environment.cupsService
+        Task { @MainActor in
+            do {
+                guard let result = try await PrintPanelService()
+                    .showProperties(
+                        queue: queue, displayName: displayName,
+                        cupsService: cups)
+                else {
+                    printNotice = Notice(
+                        kind: .info,
+                        text: "Printer properties dialog cancelled.",
+                        autoHideAfter: nil
+                    )
+                    return
+                }
+                if let selected = result.selectedPrinter,
+                   printers.contains(where: { $0.name == selected }),
+                   selected != queue {
+                    selectedPrinter = selected
+                    await reloadSelectedCapabilities()
+                }
+                if let captured = result.options.cupsOptions {
+                    capturedCupsOptions[selectedPrinter] = captured
+                }
+                if let media = result.options.mediaType {
+                    selectedMediaType = media
+                }
+                printNotice = Notice(
+                    kind: .info,
+                    text: "Settings captured for \(selectedPrinter).",
+                    autoHideAfter: nil
+                )
+            } catch {
+                printNotice = Notice(kind: .error, text: error.localizedDescription)
+            }
+        }
+    }
+
+    func printAllPages(from result: PrinttargResult, pageSize: PageSize) {
+        guard !isPrinting else { return }
+        isPrinting = true
+        let task = Task { @MainActor [weak self] in
+            guard let self else { return }
+            defer { self.printTask = nil }
+            var printed = 0
+            for page in result.pages {
+                do {
+                    try await spool(page, index: page.index, pageSize: pageSize)
+                    printed += 1
+                } catch {
+                    printNotice = Notice(
+                        kind: .error,
+                        text: "Print failed on \(page.page.filename): "
+                            + error.localizedDescription
+                    )
+                    isPrinting = false
+                    return
+                }
+            }
+            printNotice = Notice(
+                kind: .info,
+                text: "Sent \(printed) page(s) to \(selectedPrinter).",
+                autoHideAfter: nil
+            )
+            isPrinting = false
+        }
+        printTask = task
+    }
+
+    func printPage(_ page: GalleryPage, pageSize: PageSize) {
+        guard !isPrinting else { return }
+        isPrinting = true
+        let task = Task { @MainActor [weak self] in
+            guard let self else { return }
+            defer { self.printTask = nil }
+            do {
+                try await spool(page, index: page.index, pageSize: pageSize)
+                printNotice = Notice(
+                    kind: .info,
+                    text: "Sent \(page.page.filename) to \(selectedPrinter).",
+                    autoHideAfter: nil
+                )
+            } catch {
+                printNotice = Notice(
+                    kind: .error,
+                    text: "Print failed: \(error.localizedDescription)"
+                )
+            }
+            isPrinting = false
+        }
+        printTask = task
+    }
+
+    private func spool(_ page: GalleryPage, index: Int, pageSize: PageSize) async throws {
+        guard !selectedPrinter.isEmpty else {
+            throw CupsError.noPrinterSelected
+        }
+        let options = PrintOptions(
+            orientation: printOrientation,
+            paperSize: pageSize == .custom ? nil : pageSize.rawValue,
+            mediaType: selectedMediaType,
+            ppdUncorrectedPassthrough: true,
+            cupsOptions: capturedCupsOptions[selectedPrinter])
+        try await environment.cupsService.printTarget(
+            queue: selectedPrinter,
+            tiffPath: page.fileURL.path,
+            options: options,
+            page: index)
+        wizard.printerName = selectedPrinter
+    }
+}
diff --git a/Sources/ICCery/ProcessLogView.swift b/Sources/ICCery/ProcessLogView.swift
new file mode 100644
index 0000000..dfdd216
--- /dev/null
+++ b/Sources/ICCery/ProcessLogView.swift
@@ -0,0 +1,27 @@
+import SwiftUI
+
+/// Shared monospaced process-log disclosure used by Stage 1 and Stage 2.
+struct ProcessLogView: View {
+    let lines: [String]
+    var minHeight: CGFloat = 120
+    var maxHeight: CGFloat = 200
+    var containerId: String
+    var logId: String
+
+    var body: some View {
+        DisclosureGroup("Process log") {
+            ScrollView {
+                Text(lines.joined(separator: "\n"))
+                    .font(.system(.caption, design: .monospaced))
+                    .foregroundStyle(Theme.text)
+                    .frame(maxWidth: .infinity, alignment: .leading)
+                    .textSelection(.enabled)
+            }
+            .frame(minHeight: minHeight, maxHeight: maxHeight)
+            .accessibilityIdentifier(logId)
+        }
+        .foregroundStyle(Theme.text)
+        .accessibilityElement(children: .contain)
+        .accessibilityIdentifier(containerId)
+    }
+}
diff --git a/Sources/ICCery/ProcessRunSupport.swift b/Sources/ICCery/ProcessRunSupport.swift
new file mode 100644
index 0000000..0302d02
--- /dev/null
+++ b/Sources/ICCery/ProcessRunSupport.swift
@@ -0,0 +1,26 @@
+import Foundation
+
+/// Shared hop for coalesced Argyll log batches (issue #80).
+/// The runner invokes the sink off the main actor; this is the single hop back.
+enum ProcessRunSupport {
+    static func logSink(
+        _ apply: @escaping @MainActor @Sendable ([String]) -> Void
+    ) -> @Sendable ([String]) -> Void {
+        { batch in
+            Task { @MainActor in apply(batch) }
+        }
+    }
+
+    @MainActor
+    static func runLogged<T>(
+        setRunning: (Bool) -> Void,
+        resetLog: () -> Void,
+        onLog: @escaping @MainActor @Sendable ([String]) -> Void,
+        work: (@escaping @Sendable ([String]) -> Void) async throws -> T
+    ) async throws -> T {
+        setRunning(true)
+        resetLog()
+        defer { setRunning(false) }
+        return try await work(logSink(onLog))
+    }
+}
diff --git a/Sources/ICCery/ProfileWorkflowViewModel.swift b/Sources/ICCery/ProfileWorkflowViewModel.swift
index 8083ead..589ed21 100644
--- a/Sources/ICCery/ProfileWorkflowViewModel.swift
+++ b/Sources/ICCery/ProfileWorkflowViewModel.swift
@@ -123,11 +123,15 @@ final class ProfileWorkflowViewModel {
 
     func applyPreset(_ preset: ProfilingPreset?) {
         guard let preset else { return }
-        algorithm = preset.colprofAlgorithm ?? "l"
-        quality = preset.colprofQuality ?? "m"
-        intent = preset.colprofIntent ?? ""
-
-        if let fwa = preset.colprofFwa {
+        let config = ColprofConfig(
+            preset: preset,
+            basename: wizard.basename,
+            workingDirectory: wizard.effectiveWorkingDirectory
+        )
+        algorithm = config.algorithm
+        quality = config.quality
+        intent = config.intent ?? ""
+        if let fwa = config.fwa {
             switch fwa.lowercased() {
             case "none": fwaSelection = .none
             case "": fwaSelection = .empty
@@ -138,11 +142,10 @@ final class ProfileWorkflowViewModel {
                 fwaCustomPath = fwa
             }
         }
-
-        illuminant = preset.colprofIlluminant ?? ""
-        observer = preset.colprofObserver ?? ""
-        inputViewingCond = preset.colprofInputViewingCond ?? ""
-        outputViewingCond = preset.colprofOutputViewingCond ?? ""
+        illuminant = config.illuminant ?? ""
+        observer = config.observer ?? ""
+        inputViewingCond = config.inputViewingCond ?? ""
+        outputViewingCond = config.outputViewingCond ?? ""
     }
 
     /// Stage 4 form values for saving into a custom preset.
@@ -205,16 +208,13 @@ final class ProfileWorkflowViewModel {
             defer { self.isColprofRunning = false }
 
             do {
-                let url = try await runner.runColprof(config: config) { [weak self] batch in
-                    Task { @MainActor [weak self] in
-                        guard let self else { return }
-                        self.colprofLog.append(contentsOf: batch)
-                        if let last = batch.last {
-                            let progress = ColprofProgressClassifier.classify(line: last)
-                            self.updateProgress(progress)
-                        }
+                let url = try await runner.runColprof(config: config, onLogBatch: ProcessRunSupport.logSink { [weak self] batch in
+                    guard let self else { return }
+                    self.colprofLog.append(contentsOf: batch)
+                    if let last = batch.last {
+                        self.updateProgress(ColprofProgressClassifier.classify(line: last))
                     }
-                }
+                })
 
                 var finalProfileURL = url
 
@@ -231,11 +231,9 @@ final class ProfileWorkflowViewModel {
                 // Gamut extraction is best-effort for Stage 5 / M6 viewer.
                 do {
                     let gamConfig = IccgamutConfig(profileURL: finalProfileURL)
-                    let gamURL = try await runner.runIccgamut(config: gamConfig) { [weak self] batch in
-                        Task { @MainActor [weak self] in
-                            self?.colprofLog.append(contentsOf: batch)
-                        }
-                    }
+                    let gamURL = try await runner.runIccgamut(config: gamConfig, onLogBatch: ProcessRunSupport.logSink { [weak self] batch in
+                        self?.colprofLog.append(contentsOf: batch)
+                    })
                     self.createdGamutURL = gamURL
                     self.colprofLog.append("Gamut mesh extracted: \(gamURL.lastPathComponent)")
                 } catch {
@@ -327,11 +325,9 @@ final class ProfileWorkflowViewModel {
             defer { self.isProfcheckRunning = false }
 
             do {
-                let report = try await runner.runProfcheck(config: config) { [weak self] batch in
-                    Task { @MainActor [weak self] in
-                        self?.colprofLog.append(contentsOf: batch)
-                    }
-                }
+                let report = try await runner.runProfcheck(config: config, onLogBatch: ProcessRunSupport.logSink { [weak self] batch in
+                    self?.colprofLog.append(contentsOf: batch)
+                })
                 self.profcheckReport = report
                 if let record = self.makeVerificationRecord(from: report) {
                     let updated = try await self.environment.historyStore.append(record)
diff --git a/Sources/ICCery/RootView.swift b/Sources/ICCery/RootView.swift
index 2f9ab9a..cfedcb1 100644
--- a/Sources/ICCery/RootView.swift
+++ b/Sources/ICCery/RootView.swift
@@ -85,7 +85,7 @@ private struct WizardStageContent: View {
         case .calibrate:
             CalibrationView(model: workflow.calibration, wizard: workflow.wizard)
         @unknown default:
-            StagePlaceholderView(stage: model.stage)
+            Stage1View(workflow: workflow)
         }
     }
 }
diff --git a/Sources/ICCery/Stage1View.swift b/Sources/ICCery/Stage1View.swift
index 503f08e..349b100 100644
--- a/Sources/ICCery/Stage1View.swift
+++ b/Sources/ICCery/Stage1View.swift
@@ -238,19 +238,12 @@ struct Stage1View: View {
     }
 
     private var logSection: some View {
-        DisclosureGroup("Process log") {
-            ScrollView {
-                Text(workflow.targenLog.joined(separator: "\n"))
-                    .font(.system(.caption, design: .monospaced))
-                    .foregroundStyle(Theme.text)
-                    .frame(maxWidth: .infinity, alignment: .leading)
-                    .textSelection(.enabled)
-            }
-            .frame(minHeight: 120, maxHeight: 200)
-            .accessibilityIdentifier("targenLog")
-        }
-        .foregroundStyle(Theme.text)
-        .accessibilityElement(children: .contain)
-        .accessibilityIdentifier("targenLogContainer")
+        ProcessLogView(
+            lines: workflow.targenLog,
+            minHeight: 120,
+            maxHeight: 200,
+            containerId: "targenLogContainer",
+            logId: "targenLog"
+        )
     }
 }
diff --git a/Sources/ICCery/Stage2View.swift b/Sources/ICCery/Stage2View.swift
index 5f79f2b..d201198 100644
--- a/Sources/ICCery/Stage2View.swift
+++ b/Sources/ICCery/Stage2View.swift
@@ -171,20 +171,13 @@ struct Stage2View: View {
     }
 
     private var logSection: some View {
-        DisclosureGroup("Process log") {
-            ScrollView {
-                Text(workflow.printtargLog.joined(separator: "\n"))
-                    .font(.system(.caption, design: .monospaced))
-                    .foregroundStyle(Theme.text)
-                    .frame(maxWidth: .infinity, alignment: .leading)
-                    .textSelection(.enabled)
-            }
-            .frame(minHeight: 100, maxHeight: 180)
-            .accessibilityIdentifier("printtargLog")
-        }
-        .foregroundStyle(Theme.text)
-        .accessibilityElement(children: .contain)
-        .accessibilityIdentifier("printtargLogContainer")
+        ProcessLogView(
+            lines: workflow.printtargLog,
+            minHeight: 100,
+            maxHeight: 180,
+            containerId: "printtargLogContainer",
+            logId: "printtargLog"
+        )
     }
 
     // MARK: - TIFF gallery (#tiffGallery) — host-side PNG only (#58)
@@ -219,18 +212,18 @@ struct Stage2View: View {
         VStack(alignment: .leading, spacing: 10) {
             HStack(spacing: 12) {
                 Text("Print").font(.headline).foregroundStyle(Theme.text)
-                if let notice = workflow.printNotice {
-                    Image(systemName: workflow.printNoticeIsError
+                if let notice = workflow.print.printNotice {
+                    Image(systemName: notice.kind == .error
                           ? "xmark.circle.fill" : "info.circle.fill")
-                        .foregroundStyle(workflow.printNoticeIsError
+                        .foregroundStyle(notice.kind == .error
                                          ? .red : .blue)
                         .accessibilityIdentifier("printNotificationIcon")
-                    Text(notice)
+                    Text(notice.text)
                         .font(.caption)
-                        .foregroundStyle(workflow.printNoticeIsError
+                        .foregroundStyle(notice.kind == .error
                                          ? .red : .secondary)
                         .accessibilityIdentifier("printNotificationText")
-                        .accessibilityValue(notice)
+                        .accessibilityValue(notice.text)
                 }
                 Spacer()
             }
@@ -238,21 +231,21 @@ struct Stage2View: View {
 
             // Printer row: select + status + refresh + Preferences.
             HStack(spacing: 10) {
-                Picker("Printer", selection: $workflow.selectedPrinter) {
-                    ForEach(workflow.printers, id: \.name) { printer in
+                Picker("Printer", selection: $workflow.print.selectedPrinter) {
+                    ForEach(workflow.print.printers, id: \.name) { printer in
                         Text(printer.displayName ?? printer.name)
                             .tag(printer.name)
                     }
                 }
                 .frame(maxWidth: 320)
                 .accessibilityIdentifier("printerSelect")
-                .onChange(of: workflow.selectedPrinter) { _, _ in
-                    workflow.selectedTray = nil
-                    workflow.selectedMediaType = nil
-                    Task { @MainActor in await workflow.reloadSelectedCapabilities() }
+                .onChange(of: workflow.print.selectedPrinter) { _, _ in
+                    workflow.print.selectedTray = nil
+                    workflow.print.selectedMediaType = nil
+                    Task { @MainActor in await workflow.print.reloadSelectedCapabilities() }
                 }
-                if let selected = workflow.printers
-                    .first(where: { $0.name == workflow.selectedPrinter }) {
+                if let selected = workflow.print.printers
+                    .first(where: { $0.name == workflow.print.selectedPrinter }) {
                     Text(selected.status.rawValue)
                         .font(.caption).foregroundStyle(.secondary)
                         .padding(.horizontal, 8).padding(.vertical, 3)
@@ -260,33 +253,33 @@ struct Stage2View: View {
                         .clipShape(Capsule())
                         .accessibilityIdentifier("printerStatusBadge")
                 }
-                Button(action: workflow.refreshPrinters) {
+                Button(action: workflow.print.refreshPrinters) {
                     Image(systemName: "arrow.clockwise")
                 }
                 .help("Refresh printer list")
                 .accessibilityIdentifier("btnRefreshPrinters")
-                Button(action: workflow.openPrinterPreferences) {
+                Button(action: workflow.print.openPrinterPreferences) {
                     Image(systemName: "gearshape")
                 }
                 .help("Printer properties — bound NSPrintPanel")
-                .disabled(workflow.selectedPrinter.isEmpty)
+                .disabled(workflow.print.selectedPrinter.isEmpty)
                 .accessibilityIdentifier("btnPrinterProperties")
             }
 
             // Tray / media / orientation — from queue capabilities.
             HStack(spacing: 14) {
-                if !workflow.printerCaps.trays.isEmpty {
-                    Picker("Tray", selection: $workflow.selectedTray) {
-                        ForEach(workflow.printerCaps.trays, id: \.id) {
+                if !workflow.print.printerCaps.trays.isEmpty {
+                    Picker("Tray", selection: $workflow.print.selectedTray) {
+                        ForEach(workflow.print.printerCaps.trays, id: \.id) {
                             Text($0.name).tag(Optional($0.id))
                         }
                     }
                     .frame(maxWidth: 200)
                     .accessibilityIdentifier("printerTraySelect")
                 }
-                if !workflow.printerCaps.mediaTypes.isEmpty {
-                    Picker("Media", selection: $workflow.selectedMediaType) {
-                        ForEach(workflow.printerCaps.mediaTypes, id: \.id) {
+                if !workflow.print.printerCaps.mediaTypes.isEmpty {
+                    Picker("Media", selection: $workflow.print.selectedMediaType) {
+                        ForEach(workflow.print.printerCaps.mediaTypes, id: \.id) {
                             Text($0.name).tag(Optional($0.id))
                         }
                     }
@@ -296,27 +289,31 @@ struct Stage2View: View {
                     .accessibilityIdentifier("printerMediaTypeSelect")
                 }
                 HStack(spacing: 0) {
-                    Button("Portrait") { workflow.printOrientation = "portrait" }
+                    Button("Portrait") { workflow.print.printOrientation = "portrait" }
                         .buttonStyle(.bordered)
-                        .tint(workflow.printOrientation == "portrait" ? .accentColor : .gray)
+                        .tint(workflow.print.printOrientation == "portrait" ? .accentColor : .gray)
                         .accessibilityIdentifier("btnOrientPortrait")
-                    Button("Landscape") { workflow.printOrientation = "landscape" }
+                    Button("Landscape") { workflow.print.printOrientation = "landscape" }
                         .buttonStyle(.bordered)
-                        .tint(workflow.printOrientation == "landscape" ? .accentColor : .gray)
+                        .tint(workflow.print.printOrientation == "landscape" ? .accentColor : .gray)
                         .accessibilityIdentifier("btnOrientLandscape")
                 }
                 Spacer()
             }
 
             HStack(spacing: 8) {
-                Button(action: workflow.printAllPages) {
-                    Label(workflow.isPrinting ? "Printing…" : "Print All",
+                Button(action: {
+                    if let result = workflow.printtargResult {
+                        workflow.print.printAllPages(from: result, pageSize: workflow.pageSize)
+                    }
+                }) {
+                    Label(workflow.print.isPrinting ? "Printing…" : "Print All",
                           systemImage: "printer")
                 }
                 .controlSize(.large)
-                .disabled(workflow.isPrinting
+                .disabled(workflow.print.isPrinting
                           || workflow.printtargResult == nil
-                          || workflow.selectedPrinter.isEmpty)
+                          || workflow.print.selectedPrinter.isEmpty)
                 .accessibilityIdentifier("btnPrintAll")
                 Spacer()
                 Button("Advance to Stage 3") { workflow.advanceToStage3() }
@@ -333,8 +330,8 @@ struct Stage2View: View {
         .task(id: workflow.printtargResult?.pages.count) {
             // Auto-enumerate once a manifest exists and whenever it
             // changes (e.g. resume from .ti2).
-            if workflow.printers.isEmpty, workflow.printtargResult != nil {
-                workflow.refreshPrinters()
+            if workflow.print.printers.isEmpty, workflow.printtargResult != nil {
+                workflow.print.refreshPrinters()
             }
         }
     }
@@ -364,9 +361,9 @@ private struct GalleryPageView: View {
             Text("\(page.page.patches) patches · " +
                  "\(Int(page.page.widthMm))×\(Int(page.page.heightMm)) mm")
                 .font(.caption2).foregroundStyle(.secondary)
-            Button("Print") { workflow.printPage(page) }
-                .disabled(workflow.isPrinting
-                          || workflow.selectedPrinter.isEmpty)
+            Button("Print") { workflow.print.printPage(page, pageSize: workflow.pageSize) }
+                .disabled(workflow.print.isPrinting
+                          || workflow.print.selectedPrinter.isEmpty)
                 .accessibilityIdentifier("btnPrintPage-\(page.index)")
         }
         .padding(8)
diff --git a/Sources/ICCery/Stage3View.swift b/Sources/ICCery/Stage3View.swift
index 290b2d3..1c9aa2c 100644
--- a/Sources/ICCery/Stage3View.swift
+++ b/Sources/ICCery/Stage3View.swift
@@ -371,9 +371,9 @@ struct Stage3View: View {
                 }
 
                 if let notice = model.finishNotice {
-                    Text(notice)
+                    Text(notice.text)
                         .font(.caption)
-                        .foregroundStyle(model.finishNoticeIsError ? .red : .green)
+                        .foregroundStyle(notice.kind == .error ? .red : .green)
                 }
             }
             .padding(16)
diff --git a/Sources/ICCery/StagePlaceholderView.swift b/Sources/ICCery/StagePlaceholderView.swift
deleted file mode 100644
index ae92b96..0000000
--- a/Sources/ICCery/StagePlaceholderView.swift
+++ /dev/null
@@ -1,24 +0,0 @@
-import SwiftUI
-import ICCeryCore
-
-/// Placeholder stage surface for M1. Real stage UIs arrive in M2–M5
-/// (issues #7–#31); Stage 0 lands in M6 (issue #29).
-struct StagePlaceholderView: View {
-    let stage: WizardStage
-
-    var body: some View {
-        VStack(spacing: 16) {
-            Image(systemName: stage.symbolName)
-                .font(.system(size: 44))
-                .foregroundStyle(Theme.accent)
-            Text(stage.title)
-                .font(.title2)
-                .foregroundStyle(Theme.text)
-            Text("This stage is not implemented yet — see the milestone plan.")
-                .font(.callout)
-                .foregroundStyle(.secondary)
-        }
-        .frame(maxWidth: .infinity, maxHeight: .infinity)
-        .background(Theme.background)
-    }
-}
diff --git a/Sources/ICCery/TargetWorkflowViewModel.swift b/Sources/ICCery/TargetWorkflowViewModel.swift
index 689012d..52159d2 100644
--- a/Sources/ICCery/TargetWorkflowViewModel.swift
+++ b/Sources/ICCery/TargetWorkflowViewModel.swift
@@ -89,30 +89,6 @@ final class TargetWorkflowViewModel {
     /// Stage 3 (`#stage3LoadedTargetBanner` data).
     var resumedFromTi2 = false
 
-    // MARK: - Print panel (issue 17)
-
-    /// CUPS destinations from `lpstat` (#printerSelect).
-    var printers: [Printer] = []
-    /// Selected queue name.
-    var selectedPrinter = ""
-    /// Capabilities of the selected queue (#printerTraySelect /
-    /// #printerMediaTypeSelect / PageSize source).
-    var printerCaps = PrinterCapabilities()
-    var selectedTray: Int?
-    var selectedMediaType: String?
-    /// "portrait" | "landscape" (#btnOrientPortrait/#btnOrientLandscape).
-    var printOrientation = "portrait"
-    /// Per-queue captured `key=value` strings from Preferences — replayed
-    /// on `lp` (session-only, docs/11 §capturedCupsOptions).
-    var capturedCupsOptions: [String: String] = [:]
-    /// In-panel notice (#printNotification) — cancel → info, not error.
-    var printNotice: String?
-    var printNoticeIsError = false
-    var isPrinting = false
-    /// Strong reference to the active print task so the unstructured
-    /// `Task` is not dropped before it resumes.
-    private var printTask: Task<Void, Never>?
-
     // MARK: - Presets
 
     var presets: [ProfilingPreset] = []
@@ -130,6 +106,8 @@ final class TargetWorkflowViewModel {
     var profile: ProfileWorkflowViewModel
     /// Stage 0 calibration workflow.
     var calibration: CalibrationViewModel!
+    /// Stage 2 unmanaged print session.
+    var print: PrintSessionViewModel!
 
     init(environment: AppEnvironment = .live()) {
         self.environment = environment
@@ -142,6 +120,7 @@ final class TargetWorkflowViewModel {
             wizard: wizard,
             environment: environment
         )
+        self.print = PrintSessionViewModel(wizard: wizard, environment: environment)
         self.calibration = nil
         self.calibration = CalibrationViewModel(
             workflow: self,
@@ -233,10 +212,12 @@ final class TargetWorkflowViewModel {
         let runner = environment.runner
         Task { @MainActor in
             do {
-                let url = try await runner.runTargen(config: config) { [weak self] batch in
-                    Task { @MainActor [weak self] in
-                        self?.targenLog.append(contentsOf: batch)
-                    }
+                let url = try await ProcessRunSupport.runLogged(
+                    setRunning: { self.targenRunning = $0 },
+                    resetLog: { self.targenLog = [] },
+                    onLog: { self.targenLog.append(contentsOf: $0) }
+                ) { onLog in
+                    try await runner.runTargen(config: config, onLogBatch: onLog)
                 }
                 wizard.setTarget(
                     basename: config.basename,
@@ -247,8 +228,8 @@ final class TargetWorkflowViewModel {
             } catch {
                 wizard.showNotice(
                     "targen failed: \(error.localizedDescription)", kind: .error)
+                targenRunning = false
             }
-            targenRunning = false
         }
     }
 
@@ -284,8 +265,6 @@ final class TargetWorkflowViewModel {
             } else {
                 wizard.showNotice("Imported dataset is not ready for profiling.", kind: .warning)
             }
-        } catch let error as CGATSParseError {
-            wizard.showNotice("Import failed: \(error.localizedDescription)", kind: .error)
         } catch {
             wizard.showNotice("Import failed: \(error.localizedDescription)", kind: .error)
         }
@@ -366,22 +345,21 @@ final class TargetWorkflowViewModel {
         let runner = environment.runner
         Task { @MainActor in
             do {
-                let result = try await runner.runPrinttarg(config: config) { [weak self] batch in
-                    Task { @MainActor [weak self] in
-                        self?.printtargLog.append(contentsOf: batch)
-                    }
+                let result = try await ProcessRunSupport.runLogged(
+                    setRunning: { self.printtargRunning = $0 },
+                    resetLog: { self.printtargLog = [] },
+                    onLog: { self.printtargLog.append(contentsOf: $0) }
+                ) { onLog in
+                    try await runner.runPrinttarg(config: config, onLogBatch: onLog)
                 }
                 printtargResult = result
                 wizard.refreshGating()
                 wizard.showNotice(
                     "Layout created — \(result.manifest.pages.count) page(s) ready.")
             } catch {
-                // Stay on Stage 2: non-zero exit, malformed manifest, or
-                // missing .ti2 must never advance the wizard (#156).
                 wizard.showNotice(
                     "printtarg failed: \(error.localizedDescription)", kind: .error)
             }
-            printtargRunning = false
         }
     }
 
@@ -391,160 +369,6 @@ final class TargetWorkflowViewModel {
         wizard.go(to: .measure)
     }
 
-    // MARK: - Print panel actions (issue 17)
-
-    /// `#btnRefreshPrinters` — re-enumerate CUPS destinations and load
-    /// capabilities for the selection. Auto-runs when the panel first
-    /// appears with a manifest.
-    func refreshPrinters() {
-        let cups = environment.cupsService
-        Task { @MainActor in
-            do {
-                let list = try await cups.listPrinters()
-                printers = list
-                if !list.contains(where: { $0.name == selectedPrinter }) {
-                    selectedPrinter = list.first { $0.isDefault }?.name
-                        ?? list.first?.name ?? ""
-                }
-                await reloadSelectedCapabilities()
-            } catch {
-                printNotice = "Could not list printers: \(error.localizedDescription)"
-                printNoticeIsError = true
-            }
-        }
-    }
-
-    /// Capabilities for `selectedPrinter` — trays / media / sizes feed
-    /// the selects.
-    func reloadSelectedCapabilities() async {
-        guard !selectedPrinter.isEmpty else {
-            printerCaps = PrinterCapabilities()
-            return
-        }
-        do {
-            printerCaps = try await environment.cupsService
-                .capabilities(for: selectedPrinter)
-            // Default selections only when the captured options didn't
-            // already pin them (Preferences round-trip wins).
-            if selectedMediaType == nil {
-                selectedMediaType = printerCaps.mediaTypes.first?.id
-            }
-            if selectedTray == nil {
-                selectedTray = printerCaps.trays.first?.id
-            }
-        } catch {
-            printerCaps = PrinterCapabilities()
-        }
-    }
-
-    /// `#btnPrinterProperties` — bound NSPrintPanel ("Use Settings").
-    /// Cancel → info notice, never an error, cache untouched. On OK the
-    /// captured options are stored per-queue; a panel-side queue switch
-    /// updates `printerSelect` when the returned CUPS id is in the list.
-    func openPrinterPreferences() {
-        guard !selectedPrinter.isEmpty else { return }
-        let queue = selectedPrinter
-        let displayName = printers.first { $0.name == queue }?.displayName
-        let cups = environment.cupsService
-        Task { @MainActor in
-            do {
-                guard let result = try await PrintPanelService()
-                    .showProperties(
-                        queue: queue, displayName: displayName,
-                        cupsService: cups)
-                else {
-                    printNotice = "Printer properties dialog cancelled."
-                    printNoticeIsError = false
-                    return
-                }
-                if let selected = result.selectedPrinter,
-                   printers.contains(where: { $0.name == selected }),
-                   selected != queue {
-                    selectedPrinter = selected
-                    await reloadSelectedCapabilities()
-                }
-                if let captured = result.options.cupsOptions {
-                    capturedCupsOptions[selectedPrinter] = captured
-                }
-                if let media = result.options.mediaType {
-                    selectedMediaType = media
-                }
-                printNotice = "Settings captured for \(selectedPrinter)."
-                printNoticeIsError = false
-            } catch {
-                printNotice = error.localizedDescription
-                printNoticeIsError = true
-            }
-        }
-    }
-
-    /// `#btnPrintAll` — spool every gallery TIFF, sequentially. Stops on
-    /// the first failure so the user sees which page failed.
-    func printAllPages() {
-        guard let result = printtargResult, !isPrinting else { return }
-        isPrinting = true
-        let task = Task { @MainActor [weak self] in
-            guard let self else { return }
-            defer { self.printTask = nil }
-            var printed = 0
-            for page in result.pages {
-                do {
-                    try await spool(page, index: page.index)
-                    printed += 1
-                } catch {
-                    printNotice = "Print failed on \(page.page.filename): "
-                        + error.localizedDescription
-                    printNoticeIsError = true
-                    isPrinting = false
-                    return
-                }
-            }
-            printNotice = "Sent \(printed) page(s) to \(selectedPrinter)."
-            printNoticeIsError = false
-            isPrinting = false
-        }
-        printTask = task
-    }
-
-    /// `#btnPrintPage-N` — one TIFF.
-    func printPage(_ page: GalleryPage) {
-        guard !isPrinting else { return }
-        isPrinting = true
-        let task = Task { @MainActor [weak self] in
-            guard let self else { return }
-            defer { self.printTask = nil }
-            do {
-                try await spool(page, index: page.index)
-                printNotice = "Sent \(page.page.filename) to \(selectedPrinter)."
-                printNoticeIsError = false
-            } catch {
-                printNotice = "Print failed: \(error.localizedDescription)"
-                printNoticeIsError = true
-            }
-            isPrinting = false
-        }
-        printTask = task
-    }
-
-    private func spool(_ page: GalleryPage, index: Int) async throws {
-        guard !selectedPrinter.isEmpty else {
-            throw CupsError.noPrinterSelected
-        }
-        let options = PrintOptions(
-            orientation: printOrientation,
-            paperSize: pageSize == .custom ? nil : pageSize.rawValue,
-            mediaType: selectedMediaType,
-            ppdUncorrectedPassthrough: true,
-            cupsOptions: capturedCupsOptions[selectedPrinter])
-        try await environment.cupsService.printTarget(
-            queue: selectedPrinter,
-            tiffPath: page.fileURL.path,
-            options: options,
-            page: index)
-        // For Stage 5 history (#95): record which queue printed.
-        wizard.printerName = selectedPrinter
-    }
-
     // MARK: - Presets
 
     func reloadPresets() {
@@ -554,55 +378,57 @@ final class TargetWorkflowViewModel {
     /// Applies every Stage 1/2 field of the preset to the live form
     /// (bidirectional — the draft preset's dpi=150 must be visible).
     func applyPreset(_ preset: ProfilingPreset) {
-        colourSpace = preset.colourSpace == "cmyk" ? .cmyk : .rgb
-        patchPreset = PatchCountPreset(rawValue: "\(preset.patchCount)") ?? .custom
-        customPatchCount = preset.patchCount
-        whitePatches = preset.whitePatches
-        blackPatches = preset.blackPatches
-        greySteps = preset.greySteps ?? 5; greyStepsEnabled = preset.greySteps != nil
-        singleChannelSteps = preset.singleChannelSteps ?? 5
-        singleChannelEnabled = preset.singleChannelSteps != nil
-        neutralSteps = preset.neutralSteps ?? 3
-        neutralStepsEnabled = preset.neutralSteps != nil
-        neutralConcentration = preset.neutralConcentration ?? 0.50
-        neutralConcEnabled = preset.neutralConcentration != nil
-        preconditioningProfile = preset.preconditioningProfile
-        highQuality = preset.ofpsHighQuality == true
-        adaptation = preset.ofpsAdaptation ?? 0.10
-        adaptationEnabled = preset.ofpsAdaptation != nil
-        algorithm = preset.fullSpreadAlgorithm
-            .flatMap { FullSpreadAlgorithm(presetValue: $0) } ?? .ofps
-        totalInkLimit = preset.totalInkLimit ?? 320
-        inkLimitEnabled = preset.totalInkLimit != nil
-        darkEmphasis = preset.darkEmphasis ?? 1.0
-        darkEmphasisEnabled = preset.darkEmphasis != nil
-        devicePower = preset.devicePower ?? 1.0
-        devicePowerEnabled = preset.devicePower != nil
-
-        instrument = PrintInstrument(rawValue: preset.instrument) ?? .i1
-        if let size = PageSize(rawValue: preset.pageSize) {
-            pageSize = size
-        } else if let (w, h) = Self.parseCustomPage(preset.pageSize) {
-            pageSize = .custom; customPageW = w; customPageH = h
-        } else {
-            pageSize = .a4
-        }
-        bitDepth = preset.bitDepth == 16 ? .sixteen : .eight
-        tiffDpi = preset.dpi
-        if preset.noRandomize == true {
-            layoutOrder = .raster
-        } else if (preset.randomSeed ?? 1) == 1 {
-            layoutOrder = .deterministic
-        } else {
-            layoutOrder = .customSeed
-        }
-        customSeed = preset.randomSeed ?? 1
-
+        let targen = TargenConfig(preset: preset, basename: targetBasename, workingDirectory: targetDirectory)
+        applyTargenForm(targen)
+        let printtarg = PrinttargConfig(
+            preset: preset,
+            basename: wizard.basename,
+            workingDirectory: wizard.effectiveWorkingDirectory,
+            calibrationFile: profile.applyCalibration ? profile.calibrationFile : nil
+        )
+        applyPrinttargForm(printtarg)
         profile.applyPreset(preset)
-
         selectedPresetID = preset.id
     }
 
+    private func applyTargenForm(_ config: TargenConfig) {
+        colourSpace = config.colourSpace
+        patchPreset = PatchCountPreset(rawValue: "\(config.patchCount)") ?? .custom
+        customPatchCount = config.patchCount
+        whitePatches = config.whitePatches
+        blackPatches = config.blackPatches
+        greySteps = config.greySteps ?? 5
+        greyStepsEnabled = config.greySteps != nil
+        singleChannelSteps = config.singleChannelSteps ?? 5
+        singleChannelEnabled = config.singleChannelSteps != nil
+        neutralSteps = config.neutralSteps ?? 3
+        neutralStepsEnabled = config.neutralSteps != nil
+        neutralConcentration = config.neutralConcentration ?? 0.50
+        neutralConcEnabled = config.neutralConcentration != nil
+        preconditioningProfile = config.preconditioningProfile
+        highQuality = config.ofpsHighQuality == true
+        adaptation = config.ofpsAdaptation ?? 0.10
+        adaptationEnabled = config.ofpsAdaptation != nil
+        algorithm = config.fullSpreadAlgorithm ?? .ofps
+        totalInkLimit = config.totalInkLimit ?? 320
+        inkLimitEnabled = config.totalInkLimit != nil
+        darkEmphasis = config.darkEmphasis ?? 1.0
+        darkEmphasisEnabled = config.darkEmphasis != nil
+        devicePower = config.devicePower ?? 1.0
+        devicePowerEnabled = config.devicePower != nil
+    }
+
+    private func applyPrinttargForm(_ config: PrinttargConfig) {
+        instrument = config.instrument
+        pageSize = config.pageSize
+        customPageW = config.customPageWidth
+        customPageH = config.customPageHeight
+        bitDepth = config.bitDepth
+        tiffDpi = config.dpi
+        layoutOrder = config.layoutOrder
+        customSeed = config.customSeed
+    }
+
     /// Snapshot of the live Stage 1/2 form as a custom preset.
     func saveCurrentAsPreset() {
         let name = savePresetName.trimmingCharacters(in: .whitespacesAndNewlines)
@@ -614,39 +440,11 @@ final class TargetWorkflowViewModel {
             id: "custom-\(UUID().uuidString.lowercased())",
             name: name,
             description: savePresetDesc.trimmingCharacters(in: .whitespacesAndNewlines),
-            colourSpace: colourSpace == .cmyk ? "cmyk" : "rgb",
-            patchCount: effectivePatchCount,
-            whitePatches: whitePatches,
-            blackPatches: blackPatches,
-            greySteps: greyStepsEnabled ? greySteps : nil,
-            singleChannelSteps: singleChannelEnabled ? singleChannelSteps : nil,
-            neutralSteps: neutralStepsEnabled ? neutralSteps : nil,
-            neutralConcentration: neutralConcEnabled ? neutralConcentration : nil,
-            preconditioningProfile: preconditioningProfile,
-            ofpsHighQuality: highQuality ? true : nil,
-            ofpsAdaptation: adaptationEnabled ? adaptation : nil,
-            fullSpreadAlgorithm: algorithm.presetValue,
-            totalInkLimit: inkLimitEnabled ? totalInkLimit : nil,
-            darkEmphasis: darkEmphasisEnabled ? darkEmphasis : nil,
-            devicePower: devicePowerEnabled ? devicePower : nil,
-            instrument: instrument.rawValue,
-            pageSize: pageSize == .custom
-                ? "\(Int(customPageW))x\(Int(customPageH))"
-                : pageSize.rawValue,
-            bitDepth: bitDepth.rawValue,
-            dpi: tiffDpi,
-            randomSeed: layoutOrder == .deterministic ? 1 : customSeed,
-            noRandomize: layoutOrder == .raster,
+            targen: buildTargenConfig(),
+            printtarg: buildPrinttargConfig(),
+            colprof: profile.buildColprofConfig(),
             calibrationFile: profile.calibrationFile.isEmpty ? nil : profile.calibrationFile,
-            applyCalibration: profile.applyCalibration ? true : nil,
-            colprofAlgorithm: profile.algorithm,
-            colprofQuality: profile.quality,
-            colprofIntent: profile.intent.isEmpty ? nil : profile.intent,
-            colprofFwa: profile.fwaValue,
-            colprofIlluminant: profile.illuminant.isEmpty ? nil : profile.illuminant,
-            colprofObserver: profile.observer.isEmpty ? nil : profile.observer,
-            colprofInputViewingCond: profile.inputViewingCond.isEmpty ? nil : profile.inputViewingCond,
-            colprofOutputViewingCond: profile.outputViewingCond.isEmpty ? nil : profile.outputViewingCond
+            applyCalibration: profile.applyCalibration ? true : nil
         )
         do {
             try environment.presetStore.saveCustom(preset)
@@ -710,10 +508,6 @@ final class TargetWorkflowViewModel {
     }
 
     static func parseCustomPage(_ raw: String) -> (Double, Double)? {
-        let parts = raw.lowercased().split(separator: "x")
-        guard parts.count == 2,
-              let w = Double(parts[0]), let h = Double(parts[1]),
-              w >= 50, h >= 50 else { return nil }
-        return (w, h)
+        PageSize.parseCustom(raw)
     }
 }
diff --git a/Sources/ICCery/WizardViewModel.swift b/Sources/ICCery/WizardViewModel.swift
index 1cbac02..2bf9747 100644
--- a/Sources/ICCery/WizardViewModel.swift
+++ b/Sources/ICCery/WizardViewModel.swift
@@ -67,8 +67,12 @@ final class WizardViewModel {
         self.calibrationOriginalBasename = s.calibrationOriginalBasename
         // A Force Quit mid-calibration leaves a CAL_ basename behind; restore
         // the original before the UI can do anything with it (#29).
-        if basename.hasPrefix("CAL_"), !calibrationOriginalBasename.isEmpty {
-            basename = calibrationOriginalBasename
+        if CalibrationIdentity.isCalibration(basename), !calibrationOriginalBasename.isEmpty {
+            let identity = CalibrationIdentity.parse(
+                liveBasename: basename,
+                persistedOriginal: calibrationOriginalBasename
+            )
+            basename = identity.originalBasename
             calibrationOriginalBasename = ""
             sessionMode = .profile
             stage = .generate
@@ -128,7 +132,7 @@ final class WizardViewModel {
     /// refused and the original basename is restored (#29).
     func go(to target: WizardStage) {
         guard target != .calibrate else { enterCalibration(); return }
-        if basename.hasPrefix("CAL_") {
+        if CalibrationIdentity.isCalibration(basename) {
             guard !calibrationOriginalBasename.isEmpty else {
                 showNotice(
                     "Cannot leave calibration — the original target name is missing.",
@@ -152,7 +156,7 @@ final class WizardViewModel {
     }
 
     func enterCalibration() {
-        if !basename.isEmpty, !basename.hasPrefix("CAL_"), calibrationOriginalBasename.isEmpty {
+        if !basename.isEmpty, !CalibrationIdentity.isCalibration(basename), calibrationOriginalBasename.isEmpty {
             calibrationOriginalBasename = basename
         }
         sessionMode = .calibration
diff --git a/Tests/ICCeryCoreTests/ArtefactFilesTests.swift b/Tests/ICCeryCoreTests/ArtefactFilesTests.swift
index 9a8b591..439dfce 100644
--- a/Tests/ICCeryCoreTests/ArtefactFilesTests.swift
+++ b/Tests/ICCeryCoreTests/ArtefactFilesTests.swift
@@ -122,3 +122,29 @@ struct ArtefactFilesTests {
         ))
     }
 }
+
+@Suite("ArtefactProbe profile resolve")
+struct ArtefactProbeProfileTests {
+    @Test("basename probe prefers .icm")
+    func icmWins() throws {
+        let dir = FileManager.default.temporaryDirectory
+            .appendingPathComponent("probe-\(UUID().uuidString)")
+        try FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
+        try Data("icc".utf8).write(to: dir.appendingPathComponent("job.icc"))
+        try Data("icm".utf8).write(to: dir.appendingPathComponent("job.icm"))
+        let url = ArtefactProbe.resolveProfile(basename: "job", cwd: dir)
+        #expect(url?.pathExtension == "icm")
+    }
+
+    @Test("explicit missing .icc flips to sibling .icm")
+    func flipExtension() throws {
+        let dir = FileManager.default.temporaryDirectory
+            .appendingPathComponent("probe-\(UUID().uuidString)")
+        try FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
+        let icc = dir.appendingPathComponent("job.icc")
+        let icm = dir.appendingPathComponent("job.icm")
+        try Data("icm".utf8).write(to: icm)
+        let resolved = ArtefactProbe.resolveProfile(icc)
+        #expect(resolved.path == icm.path)
+    }
+}
diff --git a/Tests/ICCeryCoreTests/JSONFileStoreTests.swift b/Tests/ICCeryCoreTests/JSONFileStoreTests.swift
new file mode 100644
index 0000000..b9f20c2
--- /dev/null
+++ b/Tests/ICCeryCoreTests/JSONFileStoreTests.swift
@@ -0,0 +1,92 @@
+import Foundation
+import Testing
+@testable import ICCeryCore
+
+@Suite("JSONFileStore")
+struct JSONFileStoreTests {
+    private func tempURL() -> URL {
+        FileManager.default.temporaryDirectory
+            .appendingPathComponent("json-store-\(UUID().uuidString).json")
+    }
+
+    @Test("Corrupt file with replaceWithDefault returns default")
+    func corruptDefaults() throws {
+        let url = tempURL()
+        try "{ not json".write(to: url, atomically: true, encoding: .utf8)
+        let store = JSONFileStore<AppSettings>(
+            fileURL: url,
+            corrupt: .replaceWithDefault,
+            defaultValue: { .default }
+        )
+        #expect(try store.load() == .default)
+        #expect(FileManager.default.fileExists(atPath: url.path))
+    }
+
+    @Test("Corrupt file with throwCorrupt throws and leaves bytes")
+    func corruptThrows() throws {
+        let url = tempURL()
+        try "not json".write(to: url, atomically: true, encoding: .utf8)
+        let store = JSONFileStore<[Int]>(
+            fileURL: url,
+            corrupt: .throwCorrupt,
+            defaultValue: { [] }
+        )
+        #expect(throws: DecodingError.self) {
+            _ = try store.load()
+        }
+        let kept = try String(contentsOf: url, encoding: .utf8)
+        #expect(kept == "not json")
+    }
+
+    @Test("Pretty sorted keys")
+    func prettySorted() throws {
+        let url = tempURL()
+        let store = JSONFileStore<AppSettings>(
+            fileURL: url,
+            corrupt: .replaceWithDefault,
+            defaultValue: { .default }
+        )
+        try store.save(.default)
+        let text = try String(contentsOf: url, encoding: .utf8)
+        #expect(text.contains("\n"))
+        #expect(text.contains("\"delta_e_good_max\""))
+    }
+}
+
+@Suite("CalibrationIdentity")
+struct CalibrationIdentityTests {
+    @Test("live foo, no persisted")
+    func livePlain() {
+        let id = CalibrationIdentity.parse(liveBasename: "foo", persistedOriginal: "")
+        #expect(id.originalBasename == "foo")
+        #expect(id.calibrationBasename == "CAL_foo")
+    }
+
+    @Test("live CAL_foo, persisted foo")
+    func liveCalPersisted() {
+        let id = CalibrationIdentity.parse(liveBasename: "CAL_foo", persistedOriginal: "foo")
+        #expect(id.originalBasename == "foo")
+        #expect(id.calibrationBasename == "CAL_foo")
+    }
+
+    @Test("live CAL_foo, empty persisted strips prefix")
+    func liveCalNoPersist() {
+        let id = CalibrationIdentity.parse(liveBasename: "CAL_foo", persistedOriginal: "")
+        #expect(id.originalBasename == "foo")
+        #expect(id.calibrationBasename == "CAL_foo")
+    }
+
+    @Test("persisted original wins")
+    func persistedWins() {
+        let id = CalibrationIdentity.parse(liveBasename: "CAL_foo", persistedOriginal: "bar")
+        #expect(id.originalBasename == "bar")
+        #expect(id.calibrationBasename == "CAL_bar")
+    }
+
+    @Test("empty live does not invent a name")
+    func emptyLive() {
+        let id = CalibrationIdentity.parse(liveBasename: "", persistedOriginal: "")
+        #expect(id.originalBasename.isEmpty)
+        #expect(id.calibrationBasename.isEmpty)
+    }
+}
diff --git a/Tests/ICCeryCoreTests/PresetTests.swift b/Tests/ICCeryCoreTests/PresetTests.swift
index 0e8c519..eaf482b 100644
--- a/Tests/ICCeryCoreTests/PresetTests.swift
+++ b/Tests/ICCeryCoreTests/PresetTests.swift
@@ -230,3 +230,61 @@ struct PresetMigrationTests {
         #expect(back.dpi == 150)
     }
 }
+
+@Suite("Preset mapping")
+struct PresetMappingTests {
+    @Test("Draft 150 DPI maps into PrinttargConfig")
+    func draftDpi() {
+        let cfg = PrinttargConfig(
+            preset: PresetCatalog.draftRGB,
+            basename: "t",
+            workingDirectory: nil,
+            calibrationFile: nil
+        )
+        #expect(cfg.dpi == 150)
+        #expect(cfg.layoutOrder == .deterministic)
+    }
+
+    @Test("Nil optional targen fields stay nil")
+    func optionalNil() {
+        let preset = ProfilingPreset(id: "x", name: "n", patchCount: 800)
+        let cfg = TargenConfig(preset: preset, basename: "t", workingDirectory: nil)
+        #expect(cfg.greySteps == nil)
+        #expect(cfg.singleChannelSteps == nil)
+        #expect(cfg.neutralSteps == nil)
+        #expect(cfg.totalInkLimit == nil)
+        #expect(cfg.darkEmphasis == nil)
+        #expect(cfg.devicePower == nil)
+    }
+
+    @Test("Custom page and FWA survive a config round-trip")
+    func roundTripConfigs() {
+        var preset = PresetCatalog.highQualityCMYK
+        preset.pageSize = "210x297"
+        preset.colprofFwa = "D50"
+        preset.greySteps = nil
+        let targen = TargenConfig(preset: preset, basename: "job", workingDirectory: nil)
+        let printtarg = PrinttargConfig(
+            preset: preset, basename: "job", workingDirectory: nil, calibrationFile: nil
+        )
+        let colprof = ColprofConfig(preset: preset, basename: "job", workingDirectory: nil)
+        #expect(printtarg.pageSize == .custom)
+        #expect(printtarg.customPageWidth == 210)
+        #expect(colprof.fwa == "D50")
+        let back = ProfilingPreset(
+            id: preset.id,
+            name: preset.name,
+            description: preset.description,
+            targen: targen,
+            printtarg: printtarg,
+            colprof: colprof,
+            calibrationFile: preset.calibrationFile,
+            applyCalibration: preset.applyCalibration
+        )
+        #expect(back.dpi == preset.dpi)
+        #expect(back.colourSpace == "cmyk")
+        #expect(back.pageSize == "210x297")
+        #expect(back.colprofFwa == "D50")
+        #expect(back.greySteps == nil)
+    }
+}