lp spool path — unmanaged raster jobs (#15)

- LpArgs.build: lp -d <queue> -t 'ICCery Target - <file>' -o
  AP_ColorMatchingMode=AP_ApplicationColorMatching -o
  AP.ColorMatchingMode=AP_ApplicationColorMatching <captured> <media
  via detected key if uncaptured> <driver bypass if uncaptured,
  never gated> <orientation-requested=3|4> <PageSize> <tiff last>.
- Never -o raw (#92): raw is dropped by the capture filter AND skipped
  at build time.
- Captured options win over derived fields (case-insensitive dedup);
  sanitise rejects ;, newlines, shell metachars — argv array only.
- CupsService.printTarget: TIFF existence check, optionKeys lookup for
  media/bypass detection, runCaptured spawn.
- ProcessID.lp(queue, page).

Tests: 9 argv golden suites — both AP_* always present, captured wins,
sanitise rejects ;, no raw.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Packages/ICCeryCore/Sources/ICCeryCore/Print/ColorMatchingAttempts.swift

@@ -0,0 +1,49 @@
+import Foundation
+
+/// Ordered private-SPI attempt table for the ColorSync suppression
+/// engine (issue 14 layer ②, docs/11).
+///
+/// The ordering is data so the exact dlsym/mode sequence is unit-
+/// testable without resolving any private symbols. The app layer walks
+/// `attempts`, resolves each symbol via `dlsym(RTLD_DEFAULT,…)`, and
+/// calls the first `(symbol, mode)` that returns `0` — verified on
+/// macOS 14+ that all three symbols exist.
+///
+/// The SPI signature is `(PMPrintSession, CFStringRef) -> OSStatus`.
+/// The second argument is the **mode string**, never integer `1`
+/// (#188 — a 3-arg call is a SIGSEGV). `AP_ColorSyncMatching` and
+/// `AP_VendorColorMatching` are forbidden modes — they re-enable
+/// ColorSync/driver colour management.
+public enum ColorMatchingAttempts {
+
+    /// dlsym order: `…Lock` first (holds the print-session lock while
+    /// setting), then the plain setter, then `…NoLock`.
+    public static let symbols: [String] = [
+        "PMSessionSetColorMatchingModeLock",
+        "PMSessionSetColorMatchingMode",
+        "PMSessionSetColorMatchingModeNoLock",
+    ]
+
+    /// Mode strings tried per symbol, in order. `AP_…` is the
+    /// documented mode; the unprefixed variant is the older alias.
+    public static let modes: [String] = [
+        "AP_ApplicationColorMatching",
+        "ApplicationColorMatching",
+    ]
+
+    /// Symbol-outer, mode-inner — the full attempt sequence; the app
+    /// stops at the first call that returns `0`.
+    public static var attempts: [(symbol: String, mode: String)] {
+        symbols.flatMap { symbol in
+            modes.map { (symbol: symbol, mode: $0) }
+        }
+    }
+
+    /// Layer ③: both spellings of the print-settings key are written
+    /// with `locked = true`. Written as `CFString` values.
+    public static let applicationMatchingValue = "AP_ApplicationColorMatching"
+    public static let printSettingsKeys: [String] = [
+        "AP_ColorMatchingMode",
+        "AP.ColorMatchingMode",
+    ]
+}

Packages/ICCeryCore/Sources/ICCeryCore/Print/CupsOptionsFilter.swift

@@ -0,0 +1,62 @@
+import Foundation
+
+/// CUPS option filtering for `PMPrintSettingsToOptions` capture
+/// (issue 14 layer ⑥, docs/11 §filter).
+///
+/// The captured `key=value` string is reduced to the options that
+/// should be replayed on `lp`: `com.apple.*` ticket keys, job
+/// bookkeeping (`collate`, `copies`, `pserrorhandler-requested`,
+/// `job-sheets`), empty values, and **both** `AP_*ColorMatchingMode`
+/// keys are dropped — `build_lp_args` always re-adds those itself
+/// (issue 15). Unknown non-`com.*` keys are kept (permissive — vendor
+/// driver keys survive).
+public enum CupsOptionsFilter {
+
+    /// Option keys forwarded from the panel to `lp` (docs/11 roster).
+    public static let relevantKeys: Set<String> = [
+        // Media
+        "MediaType", "CNIJMediaType", "EPIJ_Medi", "StpMediaType",
+        // Tray
+        "InputSlot", "AP_D_InputSlot",
+        // Size
+        "PageSize",
+        // Colour bypass
+        "CNIJIntent2", "CNIJIntent", "EPIJ_CMat", "EPIJ_CCor",
+        "EPIJ_OSColMat", "ColorCorrection", "StpColorCorrection",
+        "EpsonColorMode", "ColorModel",
+        // Quality
+        "Resolution", "cupsPrintQuality", "Quality", "EPIJ_Quality",
+        "CNIJQuality", "StpQuality", "OutputMode",
+        // Duplex
+        "Duplex", "sides",
+    ]
+
+    /// Keys we always drop regardless of the relevant list. `raw` is
+    /// included — a captured `raw=…` would re-enable CUPS raw mode and
+    /// bypass the raster filter that honours `AP_ApplicationColorMatching`
+    /// (#92).
+    public static let alwaysDropped: Set<String> = [
+        "collate", "copies", "pserrorhandler-requested", "job-sheets",
+        "AP_ColorMatchingMode", "AP.ColorMatchingMode", "raw",
+    ]
+
+    /// A `key=value` pair survives when the key is non-empty, the value
+    /// is non-empty, the key is not `com.apple.*`, not always-dropped,
+    /// and either relevant or an unknown non-`com.*` driver key.
+    public static func isRelevant(key: String, value: String) -> Bool {
+        guard !key.isEmpty, !value.isEmpty else { return false }
+        if key.hasPrefix("com.apple.") { return false }
+        if alwaysDropped.contains(key) { return false }
+        if relevantKeys.contains(key) { return true }
+        // Permissive: unknown vendor keys survive (non-com.*).
+        return !key.hasPrefix("com.")
+    }
+
+    /// `key=value key=value …` → filtered string, order preserved.
+    public static func filter(_ options: String) -> String {
+        CupsParsers.lpoptions(options)
+            .filter { isRelevant(key: $0.key, value: $0.value) }
+            .map { "\($0.key)=\($0.value)" }
+            .joined(separator: " ")
+    }
+}

Packages/ICCeryCore/Sources/ICCeryCore/Print/CupsParsers.swift

@@ -0,0 +1,253 @@
+import Foundation
+
+/// One `lpoptions -l` line: `Key/Human Label: *default choice choice`.
+public struct CupsOptionListing: Equatable, Sendable {
+    /// Machine key before `/`, e.g. `InputSlot` or `CNIJMediaType`.
+    public var key: String
+    /// Human label after `/`, e.g. `Media Source`.
+    public var label: String
+    /// All choices, `*` stripped.
+    public var choices: [String]
+    /// The `*`-prefixed default choice, if any.
+    public var defaultChoice: String?
+
+    public init(key: String, label: String, choices: [String], defaultChoice: String?) {
+        self.key = key
+        self.label = label
+        self.choices = choices
+        self.defaultChoice = defaultChoice
+    }
+}
+
+/// Pure parsers for `lpstat` / `lpoptions` / PPD text (issue 12,
+/// docs/10–11). Recorded fixtures drive the tests — no live CUPS.
+public enum CupsParsers {
+
+    // MARK: - lpstat
+
+    /// `lpstat -e` — one CUPS destination name per line.
+    public static func lpstatDestinations(_ output: String) -> [String] {
+        output.split(separator: "\n")
+            .map { $0.trimmingCharacters(in: .whitespaces) }
+            .filter { !$0.isEmpty }
+    }
+
+    /// `lpstat -p` — `printer NAME is idle. enabled since …`,
+    /// `printer NAME now printing NAME-1. …`, `printer NAME disabled
+    /// since …` → queue → status.
+    public static func lpstatStatuses(_ output: String) -> [String: PrinterStatus] {
+        var result: [String: PrinterStatus] = [:]
+        for line in output.split(separator: "\n") {
+            let text = line.trimmingCharacters(in: .whitespaces)
+            guard text.hasPrefix("printer ") else { continue }
+            let rest = text.dropFirst("printer ".count)
+            guard let sep = rest.firstIndex(of: " ") else { continue }
+            let name = String(rest[..<sep])
+            let desc = rest[sep...].lowercased()
+            if desc.contains("now printing") {
+                result[name] = .printing
+            } else if desc.contains("idle") {
+                result[name] = .idle
+            } else if desc.contains("disabled") || desc.contains("stopped") {
+                result[name] = .stopped
+            } else {
+                result[name] = .unknown
+            }
+        }
+        return result
+    }
+
+    /// `lpstat -d` — `system default destination: NAME`, or
+    /// `no system default destination` → nil.
+    public static func lpstatDefault(_ output: String) -> String? {
+        for line in output.split(separator: "\n") {
+            let text = line.trimmingCharacters(in: .whitespaces)
+            guard let colon = text.firstIndex(of: ":") else { continue }
+            let name = text[text.index(after: colon)...]
+                .trimmingCharacters(in: .whitespaces)
+            if text.lowercased().hasPrefix("system default destination"),
+               !name.isEmpty {
+                return name
+            }
+        }
+        return nil
+    }
+
+    // MARK: - lpoptions -p <queue>
+
+    /// `lpoptions -p` — `key=value` pairs, values may be
+    /// single-quoted (`printer-info='EPSON XP-55 Series'`); bare
+    /// flags (`printer-location`) parse as present-with-empty-value.
+    public static func lpoptions(_ output: String) -> [(key: String, value: String)] {
+        var pairs: [(String, String)] = []
+        var index = output.startIndex
+        while index < output.endIndex {
+            while index < output.endIndex && output[index].isWhitespace {
+                index = output.index(after: index)
+            }
+            guard index < output.endIndex else { break }
+            let tokenStart = index
+            while index < output.endIndex && output[index] != "=" && !output[index].isWhitespace {
+                index = output.index(after: index)
+            }
+            let key = String(output[tokenStart..<index])
+            guard !key.isEmpty else { break }
+            if index < output.endIndex && output[index] == "=" {
+                index = output.index(after: index)
+                if index < output.endIndex && output[index] == "'" {
+                    // Single-quoted value — scan to closing quote.
+                    index = output.index(after: index)
+                    let valueStart = index
+                    while index < output.endIndex && output[index] != "'" {
+                        index = output.index(after: index)
+                    }
+                    pairs.append((key, String(output[valueStart..<index])))
+                    if index < output.endIndex { index = output.index(after: index) }
+                } else {
+                    let valueStart = index
+                    while index < output.endIndex && !output[index].isWhitespace {
+                        index = output.index(after: index)
+                    }
+                    pairs.append((key, String(output[valueStart..<index])))
+                }
+            } else {
+                pairs.append((key, ""))
+            }
+        }
+        return pairs
+    }
+
+    /// Display name from `printer-info` in `lpoptions -p` output.
+    public static func lpoptionsDisplayName(_ output: String) -> String? {
+        guard let value = lpoptions(output)
+            .first(where: { $0.key == "printer-info" })?.value,
+            !value.isEmpty
+        else { return nil }
+        return value
+    }
+
+    // MARK: - lpoptions -l
+
+    /// `lpoptions -l` — `Key/Human Label: *Default choice2 choice3`.
+    /// A missing `/` label reuses the key.
+    public static func lpoptionsList(_ output: String) -> [CupsOptionListing] {
+        output.split(separator: "\n").compactMap { raw in
+            let line = raw.trimmingCharacters(in: .whitespaces)
+            guard let colon = line.firstIndex(of: ":") else { return nil }
+            let head = String(line[..<colon])
+            let body = line[line.index(after: colon)...]
+            let headParts = head.split(separator: "/", maxSplits: 1)
+            let key = headParts[0].trimmingCharacters(in: .whitespaces)
+            guard !key.isEmpty else { return nil }
+            let label = headParts.count > 1
+                ? headParts[1].trimmingCharacters(in: .whitespaces)
+                : key
+            var choices: [String] = []
+            var defaultChoice: String?
+            for token in body.split(separator: " ") {
+                if token.hasPrefix("*") {
+                    let value = String(token.dropFirst())
+                    defaultChoice = value
+                    choices.append(value)
+                } else {
+                    choices.append(String(token))
+                }
+            }
+            return CupsOptionListing(
+                key: key, label: label,
+                choices: choices, defaultChoice: defaultChoice)
+        }
+    }
+
+    // MARK: - PPD enrichment
+
+    /// PPD `*<key> <id>/<Human Label>:` lines → `id → label` map.
+    /// Language-qualified forms (`*en_US.<key> id/Label:`) also match.
+    public static func ppdChoiceLabels(_ ppd: String, key: String) -> [String: String] {
+        var map: [String: String] = [:]
+        for rawLine in ppd.split(separator: "\n") {
+            var line = rawLine.trimmingCharacters(in: .whitespaces)
+            guard line.hasPrefix("*"), !line.hasPrefix("**") else { continue }
+            line = String(line.dropFirst())
+            // Optional locale qualifier: `en_US.InputSlot` → `InputSlot`.
+            // Only strip when the part before the first `.` looks like
+            // a locale (short `xx`/`xx_YY`); real keys containing dots
+            // are left alone.
+            if let dot = line.firstIndex(of: ".") {
+                let prefix = line[..<dot]
+                let looksLikeLocale = (2...5).contains(prefix.count)
+                    && prefix.allSatisfy { $0.isLetter || $0 == "_" }
+                    && (prefix.count == 2 || prefix.contains("_"))
+                let candidate = line[line.index(after: dot)...]
+                if looksLikeLocale && candidate.hasPrefix(key) {
+                    line = String(candidate)
+                }
+            }
+            guard line.hasPrefix(key) else { continue }
+            var rest = line[line.index(line.startIndex, offsetBy: key.count)...]
+                .trimmingCharacters(in: .whitespaces)
+            guard let colon = rest.firstIndex(of: ":") else { continue }
+            rest = String(rest[..<colon])
+            // `<id>/<Human label>` — human label after the last `/`.
+            guard let slash = rest.firstIndex(of: "/") else { continue }
+            let id = String(rest[..<slash])
+                .trimmingCharacters(in: .whitespaces)
+            let human = String(rest[rest.index(after: slash)...])
+                .trimmingCharacters(in: .whitespaces)
+            if !id.isEmpty { map[id] = human.isEmpty ? id : human }
+        }
+        return map
+    }
+
+    // MARK: - Detection (docs/11)
+
+    /// Media-type option key in preference order — used both to read a
+    /// captured value and to emit `-o <key>=<media>`.
+    public static let mediaTypeKeys = [
+        "CNIJMediaType", "EPIJ_Medi", "StpMediaType", "MediaType"
+    ]
+
+    public static func detectMediaTypeKey(optionKeys: Set<String>) -> String? {
+        mediaTypeKeys.first { optionKeys.contains($0) }
+    }
+
+    /// Media type from a captured `key=value key=value` options string.
+    /// Prefers `MediaType`, then `EPIJ_Medi` (docs/11 §tests).
+    public static func extractMediaType(fromOptionsString options: String) -> String? {
+        let pairs = lpoptions(options)
+        if let v = pairs.first(where: { $0.key == "MediaType" })?.value {
+            return v
+        }
+        return pairs.first(where: { $0.key == "EPIJ_Medi" })?.value
+    }
+
+    /// Driver "no colour adjustment" key=value for `lpoptions -l` keys
+    /// (docs/11 layer ④): Canon `CNIJIntent2=4` else `CNIJIntent=4`;
+    /// Epson `EPIJ_CCor=0` when the key exists else `EPIJ_CMat=3`;
+    /// Gutenprint `StpColorCorrection=Uncorrected`; generic
+    /// `ColorCorrection=Uncorrected`; `EpsonColorMode=Off`.
+    public static func detectDriverColorBypass(
+        optionKeys: Set<String>
+    ) -> (key: String, value: String)? {
+        if optionKeys.contains("CNIJIntent2") { return ("CNIJIntent2", "4") }
+        if optionKeys.contains("CNIJIntent") { return ("CNIJIntent", "4") }
+        if optionKeys.contains("EPIJ_CCor") { return ("EPIJ_CCor", "0") }
+        if optionKeys.contains("EPIJ_CMat") { return ("EPIJ_CMat", "3") }
+        if optionKeys.contains("StpColorCorrection") {
+            return ("StpColorCorrection", "Uncorrected")
+        }
+        if optionKeys.contains("ColorCorrection") {
+            return ("ColorCorrection", "Uncorrected")
+        }
+        if optionKeys.contains("EpsonColorMode") { return ("EpsonColorMode", "Off") }
+        return nil
+    }
+
+    /// The key=value pairs of colour-bypass keys — used to detect
+    /// whether captured options already carry a bypass.
+    public static let bypassKeys: Set<String> = [
+        "CNIJIntent2", "CNIJIntent", "EPIJ_CMat", "EPIJ_CCor",
+        "EPIJ_OSColMat", "ColorCorrection", "StpColorCorrection",
+        "EpsonColorMode",
+    ]
+}

Packages/ICCeryCore/Sources/ICCeryCore/Print/CupsService.swift

@@ -0,0 +1,188 @@
+import Foundation
+
+/// Errors from CUPS tool invocations.
+public enum CupsError: LocalizedError, Equatable {
+    case toolFailed(tool: String, code: Int32, stderr: String)
+    case tiffMissing(String)
+
+    public var errorDescription: String? {
+        switch self {
+        case .toolFailed(let tool, let code, let stderr):
+            let detail = stderr.trimmingCharacters(in: .whitespacesAndNewlines)
+            return detail.isEmpty
+                ? "\(tool) failed with exit code \(code)"
+                : "\(tool) failed (\(code)): \(detail)"
+        case .tiffMissing(let path):
+            return "Target TIFF does not exist: \(path)"
+        }
+    }
+}
+
+/// CUPS command surface (issue 12): enumerates queues and reads
+/// per-queue capabilities via `/usr/bin/lpstat` and
+/// `/usr/bin/lpoptions`. Spawning goes through
+/// `ProcessManager.runCaptured` so spawns are logged, get killAll
+/// coverage, and share the dup-id discipline; `binaryDir`/`ppdDir` are
+/// injectable so tests use fixture scripts and never touch real CUPS.
+public struct CupsService: Sendable {
+    public let processManager: ProcessManager
+    /// Directory containing `lpstat`/`lpoptions`/`lp` — `/usr/bin` in
+    /// production, a fixture dir under test.
+    public let binaryDir: URL
+    /// `/etc/cups/ppd` in production.
+    public let ppdDir: URL
+
+    public init(
+        processManager: ProcessManager = .shared,
+        binaryDir: URL = URL(fileURLWithPath: "/usr/bin"),
+        ppdDir: URL = URL(fileURLWithPath: "/etc/cups/ppd")
+    ) {
+        self.processManager = processManager
+        self.binaryDir = binaryDir
+        self.ppdDir = ppdDir
+    }
+
+    // MARK: - Enumeration (lpstat -e/-p/-d)
+
+    /// All CUPS destinations with status and default flag. An empty
+    /// list is a valid result, not an error.
+    public func listPrinters() async throws -> [Printer] {
+        // lpstat exits non-zero when no destinations exist — an empty
+        // queue list is a valid result, not a failure (issue 12).
+        let destinationsOut = try await run(
+            "lpstat", ["-e"], id: ProcessID.lpstat("e"), tolerateFailure: true)
+        let statusOut = try await run(
+            "lpstat", ["-p"], id: ProcessID.lpstat("p"), tolerateFailure: true)
+        let defaultOut = try await run(
+            "lpstat", ["-d"], id: ProcessID.lpstat("d"), tolerateFailure: true)
+
+        let names = CupsParsers.lpstatDestinations(destinationsOut.stdout)
+        let statuses = CupsParsers.lpstatStatuses(statusOut.stdout)
+        let defaultName = CupsParsers.lpstatDefault(defaultOut.stdout)
+
+        var printers: [Printer] = []
+        for name in names {
+            let displayName = try? await displayName(for: name)
+            printers.append(Printer(
+                name: name,
+                status: statuses[name] ?? .unknown,
+                isDefault: name == defaultName,
+                displayName: displayName
+            ))
+        }
+        return printers
+    }
+
+    /// `lpoptions -p <queue>` → `printer-info` (the NSPrinter fallback
+    /// display name, docs/11 §binding).
+    public func displayName(for queue: String) async throws -> String? {
+        let result = try await run(
+            "lpoptions", ["-p", queue], id: ProcessID.lpoptions(queue))
+        return CupsParsers.lpoptionsDisplayName(result.stdout)
+    }
+
+    // MARK: - Capabilities (lpoptions -l + PPD)
+
+    /// Raw `Key/Label: choices` listings for a queue — also the input
+    /// to media-key and colour-bypass detection (docs/11 layer ④).
+    public func optionListings(for queue: String) async throws -> [CupsOptionListing] {
+        let result = try await run(
+            "lpoptions", ["-p", queue, "-l"], id: ProcessID.lpoptions("\(queue)-l"))
+        return CupsParsers.lpoptionsList(result.stdout)
+    }
+
+    /// Trays / paper sizes / media types for a queue, with PPD
+    /// `*Key id/Human:` enrichment when the queue's PPD is readable.
+    public func capabilities(for queue: String) async throws -> PrinterCapabilities {
+        let listings = try await optionListings(for: queue)
+        return capabilities(from: listings, ppd: loadPPD(for: queue))
+    }
+
+    /// Pure mapping — extracted so fixture tests need no process.
+    public func capabilities(
+        from listings: [CupsOptionListing],
+        ppd: String?
+    ) -> PrinterCapabilities {
+        var trays: [PrinterTray] = []
+        var sizes: [PrinterPaperSize] = []
+        var media: [PrinterMediaType] = []
+
+        for listing in listings {
+            switch listing.key {
+            case "InputSlot", "MediaSource":
+                trays = listing.choices.enumerated().map {
+                    PrinterTray(id: $0.offset + 1, name: $0.element)
+                }
+            case "PageSize", "MediaSize":
+                sizes = listing.choices.enumerated().map {
+                    PrinterPaperSize(id: $0.offset + 1, name: $0.element)
+                }
+            case let key where CupsParsers.mediaTypeKeys.contains(key):
+                guard media.isEmpty else { continue }
+                let labels = ppd.map {
+                    CupsParsers.ppdChoiceLabels($0, key: key)
+                } ?? [:]
+                media = listing.choices.map {
+                    PrinterMediaType(id: $0, name: labels[$0] ?? $0)
+                }
+            default:
+                continue
+            }
+        }
+        return PrinterCapabilities(
+            trays: trays, paperSizes: sizes, mediaTypes: media)
+    }
+
+    /// The set of option keys a queue advertises — input to
+    /// `detectDriverColorBypass` / `detectMediaTypeKey`.
+    public func optionKeys(for queue: String) async throws -> Set<String> {
+        Set(try await optionListings(for: queue).map(\.key))
+    }
+
+    // MARK: - Spool (issue 15)
+
+    /// `lp -d <queue> … <tiff>` — spool one target page unmanaged.
+    /// Never uses `-o raw` (#92). `page` disambiguates the process id
+    /// when several pages are spooled in sequence.
+    public func printTarget(
+        queue: String,
+        tiffPath: String,
+        options: PrintOptions,
+        page: Int = 0
+    ) async throws {
+        guard FileManager.default.fileExists(atPath: tiffPath) else {
+            throw CupsError.tiffMissing(tiffPath)
+        }
+        let optionKeys = (try? await self.optionKeys(for: queue)) ?? []
+        let argv = try LpArgs.build(
+            queue: queue, tiffPath: tiffPath,
+            options: options, optionKeys: optionKeys)
+        try await run("lp", argv, id: ProcessID.lp(queue, page: page))
+    }
+
+    // MARK: - PPD
+
+    private func loadPPD(for queue: String) -> String? {
+        let url = ppdDir.appendingPathComponent("\(queue).ppd")
+        return try? String(contentsOf: url, encoding: .utf8)
+    }
+
+    // MARK: - Spawn
+
+    @discardableResult
+    func run(
+        _ tool: String,
+        _ arguments: [String],
+        id: String,
+        tolerateFailure: Bool = false
+    ) async throws -> CapturedResult {
+        let binary = binaryDir.appendingPathComponent(tool)
+        let result = try await processManager.runCaptured(
+            id: id, binary: binary, arguments: arguments)
+        if result.exitCode != 0, !tolerateFailure {
+            throw CupsError.toolFailed(
+                tool: tool, code: result.exitCode, stderr: result.stderr)
+        }
+        return result
+    }
+}

Packages/ICCeryCore/Sources/ICCeryCore/Print/LpArgs.swift

@@ -0,0 +1,126 @@
+import Foundation
+
+/// Errors from `buildLpArgs`.
+public enum LpArgsError: LocalizedError, Equatable {
+    case unsanitisedOption(String)
+
+    public var errorDescription: String? {
+        switch self {
+        case .unsanitisedOption(let option):
+            return "Captured CUPS option contains unsafe characters: \(option)"
+        }
+    }
+}
+
+/// `lp` argv builder — issue 15, docs/11 `build_lp_args`.
+///
+/// ```
+/// lp -d <queue> -t "ICCery Target - <file>"
+///    -o AP_ColorMatchingMode=AP_ApplicationColorMatching
+///    -o AP.ColorMatchingMode=AP_ApplicationColorMatching
+///    <captured cups_options>
+///    <media_type, if no media key already captured>
+///    <driver bypass, if no bypass key captured>
+///    <orientation-requested=3|4, unless captured>
+///    <PageSize, unless captured>
+///    <tiff>
+/// ```
+///
+/// - **Never `-o raw`** — `raw` skips the raster filter that honours
+///   `AP_ApplicationColorMatching` (#92).
+/// - Captured options **win** over explicit fields: any key already
+///   present (case-insensitive) suppresses the derived `-o`.
+/// - Captured keys/values are sanitised — `;`, newlines, or shell
+///   metacharacters throw `unsanitisedOption`; args are passed as a
+///   `Process` argv array, never through a shell.
+/// - The TIFF path is always the **last** argument.
+public enum LpArgs {
+
+    /// `options` = the captured `PrintOptions`; `optionKeys` = the
+    /// queue's `lpoptions -l` key set (for media-key/bypass detection).
+    public static func build(
+        queue: String,
+        tiffPath: String,
+        options: PrintOptions,
+        optionKeys: Set<String>
+    ) throws -> [String] {
+        var argv: [String] = [
+            "-d", queue,
+            "-t", "ICCery Target - \((tiffPath as NSString).lastPathComponent)",
+            "-o", "AP_ColorMatchingMode=AP_ApplicationColorMatching",
+            "-o", "AP.ColorMatchingMode=AP_ApplicationColorMatching",
+        ]
+        var addedKeys: Set<String> = [
+            "ap_colormatchingmode", "ap.colormatchingmode",
+        ]
+
+        // Captured CUPS options — sanitised, lowercased-key dedup.
+        if let captured = options.cupsOptions, !captured.isEmpty {
+            // Newlines can't survive the tokeniser — check the raw
+            // string so embedded line breaks are still rejected.
+            if captured.contains("\n") || captured.contains("\r") {
+                throw LpArgsError.unsanitisedOption(captured)
+            }
+            for pair in CupsParsers.lpoptions(captured) {
+                try sanitize(pair.key, pair.value)
+                let lowered = pair.key.lowercased()
+                // Defence in depth: never let a captured `raw` reach
+                // argv — `-o raw` skips the raster filter that honours
+                // AP_ApplicationColorMatching (#92).
+                if lowered == "raw" { continue }
+                guard !addedKeys.contains(lowered) else { continue }
+                addedKeys.insert(lowered)
+                argv += ["-o", "\(pair.key)=\(pair.value)"]
+            }
+        }
+
+        // Media type — only when the captured options didn't carry one.
+        if let mediaType = options.mediaType,
+           let mediaKey = CupsParsers.detectMediaTypeKey(optionKeys: optionKeys),
+           !addedKeys.contains(mediaKey.lowercased()) {
+            addedKeys.insert(mediaKey.lowercased())
+            argv += ["-o", "\(mediaKey)=\(mediaType)"]
+        }
+
+        // Driver colour bypass — when no bypass key was captured. NOT
+        // gated on ppdUncorrectedPassthrough (macOS always bypasses).
+        let capturedKeys = Set(
+            CupsParsers.lpoptions(options.cupsOptions ?? "")
+                .map { $0.key })
+        if capturedKeys.isDisjoint(with: CupsParsers.bypassKeys),
+           let bypass = CupsParsers.detectDriverColorBypass(optionKeys: optionKeys),
+           !addedKeys.contains(bypass.key.lowercased()) {
+            addedKeys.insert(bypass.key.lowercased())
+            argv += ["-o", "\(bypass.key)=\(bypass.value)"]
+        }
+
+        // Orientation — portrait=3, landscape=4.
+        if let orientation = options.orientation,
+           !addedKeys.contains("orientation-requested") {
+            let value = orientation == "landscape" ? "4" : "3"
+            addedKeys.insert("orientation-requested")
+            argv += ["-o", "orientation-requested=\(value)"]
+        }
+
+        // PageSize — the printtarg layout page size.
+        if let paperSize = options.paperSize, !paperSize.isEmpty,
+           !addedKeys.contains("pagesize") {
+            argv += ["-o", "PageSize=\(paperSize)"]
+        }
+
+        argv.append(tiffPath)
+        return argv
+    }
+
+    /// Reject shell/metachar injection — args go to `Process` as an
+    /// argv array, but a hostile captured string must not smuggle a
+    /// second option or command.
+    static func sanitize(_ key: String, _ value: String) throws {
+        let forbidden = CharacterSet(charactersIn: ";\n\r`|$&<>\\\"'")
+        if key.rangeOfCharacter(from: forbidden) != nil
+            || value.rangeOfCharacter(from: forbidden) != nil
+            || key.isEmpty {
+            throw LpArgsError.unsanitisedOption("\(key)=\(value)")
+        }
+    }
+}

Packages/ICCeryCore/Sources/ICCeryCore/Print/PrinterModels.swift

@@ -0,0 +1,136 @@
+import Foundation
+
+/// Queue status reported by `lpstat -p` (docs/10 §Printer).
+public enum PrinterStatus: String, Codable, Sendable, CaseIterable {
+    case idle = "Idle"
+    case printing = "Printing"
+    case stopped = "Stopped"
+    case unknown = "Unknown"
+}
+
+/// A CUPS destination. `name` is the queue id sent back to every
+/// subsequent print command; `displayName` is the human label from
+/// `printer-info` (used as the `NSPrinter` fallback when PM binding
+/// fails — #188).
+public struct Printer: Codable, Equatable, Sendable {
+    public var name: String
+    public var status: PrinterStatus
+    public var isDefault: Bool
+    public var displayName: String?
+
+    public init(
+        name: String,
+        status: PrinterStatus = .unknown,
+        isDefault: Bool = false,
+        displayName: String? = nil
+    ) {
+        self.name = name
+        self.status = status
+        self.isDefault = isDefault
+        self.displayName = displayName
+    }
+}
+
+/// Paper source. `id` is the 1-based index of the `InputSlot` /
+/// `MediaSource` choice (not a PPD code) — docs/10.
+public struct PrinterTray: Codable, Equatable, Sendable {
+    public var id: Int
+    public var name: String
+
+    public init(id: Int, name: String) {
+        self.id = id
+        self.name = name
+    }
+}
+
+/// Media size from `PageSize` / `MediaSize` choices (1-based index).
+public struct PrinterPaperSize: Codable, Equatable, Sendable {
+    public var id: Int
+    public var name: String
+
+    public init(id: Int, name: String) {
+        self.id = id
+        self.name = name
+    }
+}
+
+/// Media type: `id` is the PPD machine token, `name` the human label
+/// after `/` when a readable PPD enriches it (docs/10 §PPD id/Human).
+public struct PrinterMediaType: Codable, Equatable, Sendable {
+    public var id: String
+    public var name: String
+
+    public init(id: String, name: String) {
+        self.id = id
+        self.name = name
+    }
+}
+
+public struct PrinterCapabilities: Codable, Equatable, Sendable {
+    public var trays: [PrinterTray]
+    public var paperSizes: [PrinterPaperSize]
+    public var mediaTypes: [PrinterMediaType]
+    /// Always `true` on macOS (spec parity — CUPS honours
+    /// `orientation-requested`).
+    public var supportsOrientation: Bool
+
+    public init(
+        trays: [PrinterTray] = [],
+        paperSizes: [PrinterPaperSize] = [],
+        mediaTypes: [PrinterMediaType] = [],
+        supportsOrientation: Bool = true
+    ) {
+        self.trays = trays
+        self.paperSizes = paperSizes
+        self.mediaTypes = mediaTypes
+        self.supportsOrientation = supportsOrientation
+    }
+}
+
+/// Options carried into `lp` (docs/10 §PrintOptions). On macOS
+/// `paperSource` is ignored unless already present inside captured
+/// `cupsOptions`; `ppdUncorrectedPassthrough` is stored (the panel sets
+/// it on OK) but never gates the argv — macOS always bypasses driver
+/// colour management.
+public struct PrintOptions: Codable, Equatable, Sendable {
+    public var paperSource: Int?
+    /// `"portrait"` / `"landscape"` → `orientation-requested=3|4`.
+    public var orientation: String?
+    /// printtarg layout page size → `PageSize=` (skipped if captured).
+    public var paperSize: String?
+    public var mediaType: String?
+    public var ppdUncorrectedPassthrough: Bool?
+    /// Space-separated `key=value` captured from
+    /// `PMPrintSettingsToOptions` and filtered (docs/11 layer ⑥).
+    public var cupsOptions: String?
+
+    public init(
+        paperSource: Int? = nil,
+        orientation: String? = nil,
+        paperSize: String? = nil,
+        mediaType: String? = nil,
+        ppdUncorrectedPassthrough: Bool? = nil,
+        cupsOptions: String? = nil
+    ) {
+        self.paperSource = paperSource
+        self.orientation = orientation
+        self.paperSize = paperSize
+        self.mediaType = mediaType
+        self.ppdUncorrectedPassthrough = ppdUncorrectedPassthrough
+        self.cupsOptions = cupsOptions
+    }
+}
+
+/// Returned by the printer-properties panel (docs/10 §PrintPropertiesResult).
+/// `nil` from the service means the user cancelled — never an error.
+public struct PrintPropertiesResult: Codable, Equatable, Sendable {
+    /// CUPS printer id the panel ended on (`PMPrinterGetID`), or `nil`
+    /// when the `NSPrinter` fallback ran.
+    public var selectedPrinter: String?
+    public var options: PrintOptions
+
+    public init(selectedPrinter: String?, options: PrintOptions) {
+        self.selectedPrinter = selectedPrinter
+        self.options = options
+    }
+}

Packages/ICCeryCore/Sources/ICCeryCore/Process/ProcessID.swift

@@ -14,4 +14,10 @@ public enum ProcessID {
     public static func iccgamut(stem: String) -> String { "iccgamut_\(stem)" }
     public static func printcal(_ stem: String) -> String { "printcal_\(stem)" }
     public static func applycal(_ stem: String) -> String { "applycal_\(stem)" }
+
+    /// CUPS system tools (`/usr/bin/…`) — captured one-shots, not
+    /// streaming Argyll children.
+    public static func lpstat(_ mode: String) -> String { "lpstat_\(mode)" }
+    public static func lpoptions(_ queue: String) -> String { "lpoptions_\(queue)" }
+    public static func lp(_ queue: String, page: Int) -> String { "lp_\(queue)_\(page)" }
 }

Packages/ICCeryCore/Sources/ICCeryCore/Process/ProcessManager.swift

@@ -1,7 +1,7 @@
 import Foundation
 
-/// Captured output from `runCaptured` (used by printcal/applycal —
-/// the only tools whose results arrive as one-shot output).
+/// Captured output from `runCaptured` — one-shot tools whose results
+/// arrive as buffered stdout/stderr (printcal/applycal, CUPS tools).
 public struct CapturedResult: Sendable, Equatable {
     public let stdout: String
     public let stderr: String
@@ -173,7 +173,8 @@ public actor ProcessManager {
 
     /// Runs a child to completion and returns all output. Reads stdout
     /// and stderr concurrently so a full pipe buffer can never deadlock
-    /// the child. Used by `printcal` / `applycal` (docs/03).
+    /// the child. Used by `printcal` / `applycal` (docs/03) and by
+    /// `CupsService` for `/usr/bin/lpstat`, `lpoptions`, `lp` (#12/#15).
     public func runCaptured(
         id: String,
         binary: URL,

Sources/ICCery/AppEnvironment.swift

@@ -11,6 +11,7 @@ struct AppEnvironment: Sendable {
     let settingsStore: SettingsStore
     let presetStore: PresetStore
     let runner: ArgyllRunner
+    let cupsService: CupsService
 
     static func live(
         environment: [String: String] = ProcessInfo.processInfo.environment
@@ -18,10 +19,14 @@ struct AppEnvironment: Sendable {
         let settingsStore = SettingsStore()
         var overrideDir = settingsStore.load().argyllBinaryDir
             .map { URL(fileURLWithPath: $0) }
+        var cupsDir = URL(fileURLWithPath: "/usr/bin")
         #if DEBUG
         if let dir = environment["ICCERY_ARGYLL_BINARY_DIR"], !dir.isEmpty {
             overrideDir = URL(fileURLWithPath: dir)
         }
+        if let dir = environment["ICCERY_CUPS_BIN_DIR"], !dir.isEmpty {
+            cupsDir = URL(fileURLWithPath: dir)
+        }
         #endif
         return AppEnvironment(
             stateStore: WizardStateStore(),
@@ -30,7 +35,10 @@ struct AppEnvironment: Sendable {
             runner: ArgyllRunner(
                 processManager: .shared,
                 binaryResolver: BinaryResolver(overrideDir: overrideDir)
-            )
+            ),
+            cupsService: CupsService(
+                processManager: .shared,
+                binaryDir: cupsDir)
         )
     }
 }
@@ -63,6 +71,48 @@ enum UITestHooks {
     /// Preset export destination.
     static var presetExportURL: URL? { url("ICCERY_TEST_PRESET_EXPORT") }
 
+    // MARK: - Print panel / CUPS stubs (issue 13/17)
+
+    /// Directory of mock `lp`/`lpstat`/`lpoptions` fixture scripts —
+    /// `CupsService.binaryDir` under UI tests.
+    static var cupsBinaryDir: URL? { url("ICCERY_CUPS_BIN_DIR") }
+
+    /// Path the mock `lp` script appends its argv to, for assertions.
+    static var lpArgvOutURL: URL? { url("ICCERY_TEST_LP_ARGV") }
+
+    /// Whether the `NSPrintPanel` should be stubbed under UI testing —
+    /// separate from the stub's *result* so "cancel" (`nil`) does not
+    /// fall through to the real modal.
+    static var printPanelStubbed: Bool { isEnabled }
+
+    /// Canned `NSPrintPanel` outcome — XCUITest cannot drive the
+    /// system modal. `ICCERY_TEST_PRINT_PANEL`:
+    /// - `cancel` (or unset while testing) → user cancelled → `nil`
+    /// - `ok` → `PrintPropertiesResult` with
+    ///   `ICCERY_TEST_PANEL_OPTIONS` (captured `k=v` string) and
+    ///   `ICCERY_TEST_PANEL_PRINTER` (selected queue; default = the
+    ///   queue the panel was opened for).
+    static func printPanelResult(forQueue queue: String) -> PrintPropertiesResult? {
+        switch env["ICCERY_TEST_PRINT_PANEL"] {
+        case "ok":
+            let options = env["ICCERY_TEST_PANEL_OPTIONS"].flatMap {
+                $0.isEmpty ? nil : $0
+            }
+            return PrintPropertiesResult(
+                selectedPrinter: env["ICCERY_TEST_PANEL_PRINTER"].flatMap {
+                    $0.isEmpty ? nil : $0
+                } ?? queue,
+                options: PrintOptions(
+                    mediaType: options.flatMap {
+                        CupsParsers.extractMediaType(fromOptionsString: $0)
+                    },
+                    ppdUncorrectedPassthrough: true,
+                    cupsOptions: options))
+        default:
+            return nil
+        }
+    }
+
     private static func url(_ key: String) -> URL? {
         guard let raw = env[key], !raw.isEmpty else { return nil }
         return URL(fileURLWithPath: raw)

Sources/ICCery/Print/ColorSyncSuppressor.swift

@@ -0,0 +1,171 @@
+import AppKit
+import ApplicationServices
+import ICCeryCore
+
+/// Private Print Manager SPI: `(PMPrintSession, CFStringRef) -> OSStatus`.
+/// The second argument is the mode string — never integer `1` (#188).
+typealias ColorMatchingModeFunction =
+    @convention(c) (PMPrintSession, CFString) -> OSStatus
+
+/// `PMPrintSettingsToOptions` — public symbol, resolved via dlsym so a
+/// missing SDK declaration can't break the build.
+typealias PrintSettingsToOptionsFunction =
+    @convention(c) (PMPrintSettings, UnsafeMutablePointer<UnsafeMutablePointer<CChar>?>) -> OSStatus
+
+/// The six-layer unmanaged-printing engine (issue 14, docs/11):
+///
+/// ① session binding — done by `PrintPanelService` before calling us.
+/// ② private SPI `PMSessionSetColorMatchingMode{Lock,,NoLock}` —
+///    resolved by `dlsym(RTLD_DEFAULT,…)`; first `(symbol, mode)`
+///    returning `0` wins.
+/// ③ `PMPrintSettingsSetValue` both `AP_ColorMatchingMode` and
+///    `AP.ColorMatchingMode` = `AP_ApplicationColorMatching`, locked.
+/// ④ driver "no colour adjustment" pre-select from `lpoptions -l`
+///    keys, unlocked (`detectDriverColorBypass`).
+/// ⑤ mirror ③+④ into `NSPrintInfo.printSettings` so the PDE sees them.
+/// ⑥ after "Use Settings": `PMPrintSettingsToOptions` →
+///    `CupsOptionsFilter` → captured `cupsOptions` + `mediaType`.
+///
+/// All layers degrade gracefully — a missing symbol or non-zero status
+/// is logged and the next layer still runs.
+@MainActor
+struct ColorSyncSuppressor {
+
+    /// Injected for tests: symbol → function. Default resolves via
+    /// `dlsym(RTLD_DEFAULT, …)`.
+    typealias ModeResolver = (String) -> ColorMatchingModeFunction?
+    typealias OptionsResolver = () -> PrintSettingsToOptionsFunction?
+
+    var modeResolver: ModeResolver = Self.dlsymMode
+    var optionsResolver: OptionsResolver = Self.dlsymOptions
+    var log: (String) -> Void = { AppLogger.shared.log(.info, $0) }
+
+    // MARK: - Layer ② SPI
+
+    /// Walk `ColorMatchingAttempts.attempts` (Lock → plain → NoLock ×
+    /// `AP_ApplicationColorMatching` → `ApplicationColorMatching`); the
+    /// first call returning `0` wins. `false` when nothing worked.
+    @discardableResult
+    func applySPIMode(to session: PMPrintSession) -> Bool {
+        for attempt in ColorMatchingAttempts.attempts {
+            guard let function = modeResolver(attempt.symbol) else {
+                continue
+            }
+            let status = function(session, attempt.mode as CFString)
+            if status == 0 {
+                log("ColorSync: \(attempt.symbol) accepted "
+                    + "\(attempt.mode)")
+                return true
+            }
+        }
+        log("ColorSync: no PMSessionSetColorMatchingMode* accepted a "
+            + "mode — falling back to PMPrintSettingsSetValue")
+        return false
+    }
+
+    // MARK: - Layer ③ locked AP_* keys
+
+    /// `PMPrintSettingsSetValue` both key spellings, locked.
+    @discardableResult
+    func applyLockedKeys(to settings: PMPrintSettings) -> Int {
+        var applied = 0
+        for key in ColorMatchingAttempts.printSettingsKeys {
+            let status = PMPrintSettingsSetValue(
+                settings,
+                key as CFString,
+                ColorMatchingAttempts.applicationMatchingValue as CFString,
+                true)
+            if status == 0 { applied += 1 }
+        }
+        if applied == 0 {
+            log("ColorSync: PMPrintSettingsSetValue could not lock "
+                + "AP_ColorMatchingMode")
+        }
+        return applied
+    }
+
+    // MARK: - Layer ④ driver bypass
+
+    /// Pre-select the driver "no colour adjustment" option, unlocked —
+    /// the PDE may override it. Returns the `(key, value)` applied.
+    @discardableResult
+    func applyDriverBypass(
+        to settings: PMPrintSettings,
+        optionKeys: Set<String>
+    ) -> (key: String, value: String)? {
+        guard let bypass = CupsParsers.detectDriverColorBypass(
+            optionKeys: optionKeys)
+        else { return nil }
+        let status = PMPrintSettingsSetValue(
+            settings,
+            bypass.key as CFString,
+            bypass.value as CFString,
+            false)
+        if status != 0 {
+            log("ColorSync: driver bypass \(bypass.key)=\(bypass.value) "
+                + "rejected (\(status))")
+            return nil
+        }
+        return bypass
+    }
+
+    // MARK: - Layer ⑤ NSPrintInfo mirror
+
+    /// Mirror the applied keys into `printSettings` so the PDE pick
+    /// sees them.
+    func mirror(
+        into printInfo: NSPrintInfo,
+        driverBypass: (key: String, value: String)?
+    ) {
+        let settings = printInfo.printSettings
+        for key in ColorMatchingAttempts.printSettingsKeys {
+            settings[key as NSString] = ColorMatchingAttempts.applicationMatchingValue as NSString
+        }
+        if let driverBypass {
+            settings[driverBypass.key as NSString] = driverBypass.value as NSString
+        }
+    }
+
+    // MARK: - Layer ⑥ capture
+
+    /// `PMPrintSettingsToOptions` → filter → `(cupsOptions, mediaType)`.
+    /// The malloc'd C string is freed after copying.
+    func captureOptions(
+        from settings: PMPrintSettings
+    ) -> (cupsOptions: String?, mediaType: String?) {
+        guard let toOptions = optionsResolver() else {
+            log("ColorSync: PMPrintSettingsToOptions unavailable — "
+                + "panel options not captured")
+            return (nil, nil)
+        }
+        var raw: UnsafeMutablePointer<CChar>?
+        guard toOptions(settings, &raw) == 0, let raw else {
+            return (nil, nil)
+        }
+        defer { free(raw) }
+        let unfiltered = String(cString: raw)
+        let filtered = CupsOptionsFilter.filter(unfiltered)
+        return (
+            filtered.isEmpty ? nil : filtered,
+            CupsParsers.extractMediaType(fromOptionsString: unfiltered)
+        )
+    }
+
+    // MARK: - dlsym
+
+    private static func dlsymMode(_ name: String) -> ColorMatchingModeFunction? {
+        guard let symbol = dlsym(Self.rtldDefault, name) else { return nil }
+        return unsafeBitCast(symbol, to: ColorMatchingModeFunction.self)
+    }
+
+    private static func dlsymOptions() -> PrintSettingsToOptionsFunction? {
+        guard let symbol = dlsym(Self.rtldDefault, "PMPrintSettingsToOptions")
+        else { return nil }
+        return unsafeBitCast(symbol, to: PrintSettingsToOptionsFunction.self)
+    }
+
+    /// `RTLD_DEFAULT` — `UnsafeMutableRawPointer(bitPattern: -2)`.
+    private static var rtldDefault: UnsafeMutableRawPointer? {
+        UnsafeMutableRawPointer(bitPattern: -2)
+    }
+}

Sources/ICCery/Print/PrintPanelService.swift

@@ -0,0 +1,185 @@
+import AppKit
+import ApplicationServices
+import ICCeryCore
+
+/// Errors raised while preparing the bound print panel.
+enum PrintPanelError: LocalizedError {
+    case sessionBindingFailed(OSStatus)
+    case noPrinterFound(String)
+
+    var errorDescription: String? {
+        switch self {
+        case .sessionBindingFailed(let status):
+            return "Could not bind the print session to the queue (OSStatus \(status))."
+        case .noPrinterFound(let name):
+            return "No printer found for '\(name)'."
+        }
+    }
+}
+
+/// Preferences → native `NSPrintPanel` bound to the selected CUPS
+/// queue (issue 13, docs/11).
+///
+/// This is a **settings-capture** dialog — the default button is
+/// "Use Settings", never "Print". It is never System Settings, the
+/// CUPS web UI, or an `NSWorkspace` open (#188). Cancel returns `nil`
+/// and is not an error.
+///
+/// Binding: `PMPrinterCreateFromPrinterID(CUPS queue id)` →
+/// `PMSessionSetCurrentPMPrinter` → session default settings/page
+/// format. `PMPrinter` is `PMRelease`d on every path. Fallback when PM
+/// binding fails: `NSPrinter(name: displayName)` (the `printer-info`
+/// label) → `printInfo.printer`.
+@MainActor
+struct PrintPanelService {
+
+    /// The suppression engine — injectable for tests.
+    var suppressor = ColorSyncSuppressor()
+
+    /// Resolves the display name (off-panel `lpoptions` fetch) and runs
+    /// the modal panel. Returns `nil` when the user cancels.
+    func showProperties(
+        queue: String,
+        displayName: String?,
+        cupsService: CupsService
+    ) async throws -> PrintPropertiesResult? {
+        #if DEBUG
+        if UITestHooks.printPanelStubbed {
+            return UITestHooks.printPanelResult(forQueue: queue)
+        }
+        #endif
+        let display = displayName
+            ?? (try? await cupsService.displayName(for: queue))
+        // Layer ④ needs the queue's option keys (lpoptions -l) to pick
+        // the driver colour-bypass before the panel opens.
+        let optionKeys = (try? await cupsService.optionKeys(for: queue))
+            ?? []
+        return try runNativePanel(
+            queue: queue, displayName: display, optionKeys: optionKeys)
+    }
+
+    // MARK: - Panel
+
+    private func runNativePanel(
+        queue: String,
+        displayName: String?,
+        optionKeys: Set<String>
+    ) throws -> PrintPropertiesResult? {
+        let printInfo = NSPrintInfo()
+        var pmPrinter: PMPrinter?
+        var boundViaPM = false
+
+        // ① Bind the session to the selected CUPS queue (docs/11).
+        if let printer = PMPrinterCreateFromPrinterID(queue as CFString) {
+            pmPrinter = printer
+            let session = unsafeBitCast(
+                printInfo.pmPrintSession(), to: PMPrintSession.self)
+            let settings = unsafeBitCast(
+                printInfo.pmPrintSettings(), to: PMPrintSettings.self)
+            let pageFormat = unsafeBitCast(
+                printInfo.pmPageFormat(), to: PMPageFormat.self)
+
+            let status = PMSessionSetCurrentPMPrinter(session, printer)
+            if status != 0 {
+                PMRelease(pmObject(printer))
+                throw PrintPanelError.sessionBindingFailed(status)
+            }
+            // Warn-only: defaults keep the panel consistent with the
+            // queue but are not fatal when they fail.
+            _ = PMSessionDefaultPrintSettings(session, settings)
+            _ = PMSessionDefaultPageFormat(session, pageFormat)
+            boundViaPM = true
+        } else {
+            // Fallback: NSPrinter by display name (docs/11 §binding).
+            guard let displayName,
+                  let nsPrinter = NSPrinter(name: displayName)
+            else {
+                throw PrintPanelError.noPrinterFound(
+                    displayName ?? queue)
+            }
+            printInfo.printer = nsPrinter
+            printInfo.setUpPrintOperationDefaultValues()
+        }
+        defer {
+            if let printer = pmPrinter {
+                PMRelease(pmObject(printer))
+            }
+        }
+
+        // ②–⑤ ColourSync suppression — only on the PM path: the SPI
+        // and PMPrintSettingsSetValue need a session with a current
+        // printer to attach to.
+        var settings = unsafeBitCast(
+            printInfo.pmPrintSettings(), to: PMPrintSettings.self)
+        var driverBypass: (key: String, value: String)?
+        if boundViaPM {
+            let session = unsafeBitCast(
+                printInfo.pmPrintSession(), to: PMPrintSession.self)
+            suppressor.applySPIMode(to: session)                    // ②
+            suppressor.applyLockedKeys(to: settings)                // ③
+            driverBypass = suppressor.applyDriverBypass(            // ④
+                to: settings, optionKeys: optionKeys)
+            suppressor.mirror(into: printInfo, driverBypass: driverBypass) // ⑤
+        }
+
+        let panel = NSPrintPanel()
+        panel.options = [
+            .showsCopies, .showsPageRange, .showsPaperSize,
+            .showsOrientation, .showsScaling, .showsPrintSelection,
+            .showsPageSetupAccessory, .showsPreview,
+        ]
+        panel.defaultButtonTitle = "Use Settings"
+
+        let response = panel.runModal(with: printInfo)
+        guard response == NSApplication.ModalResponse.OK.rawValue else {
+            return nil
+        }
+
+        // ⑥ Capture the user's choices — filtered replay options plus
+        // the media type they picked. Re-fetch the settings handle so
+        // we read back what the modal wrote.
+        var cupsOptions: String?
+        var mediaType: String?
+        if boundViaPM {
+            settings = unsafeBitCast(
+                printInfo.pmPrintSettings(), to: PMPrintSettings.self)
+            let captured = suppressor.captureOptions(from: settings)
+            cupsOptions = captured.cupsOptions
+            mediaType = captured.mediaType
+        }
+        return PrintPropertiesResult(
+            selectedPrinter: boundViaPM
+                ? Self.currentPrinterID(
+                    session: unsafeBitCast(
+                        printInfo.pmPrintSession(), to: PMPrintSession.self),
+                    fallback: queue)
+                : nil,
+            options: PrintOptions(
+                mediaType: mediaType,
+                ppdUncorrectedPassthrough: true,
+                cupsOptions: cupsOptions))
+    }
+
+    // MARK: - PM helpers
+
+    /// `PMPrinter` → `PMObject` for `PMRelease` — the Carbon API wants
+    /// `UnsafeRawPointer`, Swift imports `PMPrinter` as `OpaquePointer`.
+    static func pmObject(_ printer: PMPrinter) -> PMObject {
+        unsafeBitCast(printer, to: PMObject.self)
+    }
+
+    /// `PMSessionGetCurrentPrinter` → `PMPrinterGetID` → String.
+    private static func currentPrinterID(
+        session: PMPrintSession,
+        fallback: String
+    ) -> String {
+        var current: PMPrinter?
+        guard PMSessionGetCurrentPrinter(session, &current) == 0,
+              let printer = current
+        else { return fallback }
+        defer { PMRelease(pmObject(printer)) }
+        guard let id = PMPrinterGetID(printer)
+        else { return fallback }
+        return id.takeUnretainedValue() as String
+    }
+}

Tests/ICCeryCoreTests/CupsOptionsFilterTests.swift

@@ -0,0 +1,151 @@
+import Testing
+import Foundation
+@testable import ICCeryCore
+@testable import ICCery
+import AppKit
+import ApplicationServices
+
+/// Issue 14 — PMPrintSettingsToOptions capture filter (docs/11 layer ⑥).
+@Suite("CupsOptionsFilter")
+struct CupsOptionsFilterTests {
+
+    @Test("Drops com.apple.*, collate, copies, job-sheets, AP_* keys")
+    func dropsReserved() {
+        let raw = "AP_ColorMatchingMode=AP_ApplicationColorMatching "
+            + "AP.ColorMatchingMode=AP_ApplicationColorMatching "
+            + "com.apple.print.JobTicket.PMTotalSidesImaged=0 "
+            + "collate=true copies=1 job-sheets=none,none "
+            + "pserrorhandler-requested=standard "
+            + "MediaType=PhotographicGlossy"
+        #expect(CupsOptionsFilter.filter(raw) == "MediaType=PhotographicGlossy")
+    }
+
+    @Test("Keeps relevant driver keys, order preserved")
+    func keepsRelevant() {
+        let raw = "InputSlot=Rear PageSize=A4 CNIJIntent2=4 "
+            + "Resolution=600x600dpi Duplex=None"
+        #expect(CupsOptionsFilter.filter(raw) == raw)
+    }
+
+    @Test("Permissive: unknown non-com.* keys survive")
+    func keepsUnknown() {
+        let raw = "VendorFooBar=baz MediaType=Plain"
+        #expect(CupsOptionsFilter.filter(raw) == raw)
+    }
+
+    @Test("Drops empty keys and values")
+    func dropsEmpty() {
+        let raw = "=noval MediaType= InputSlot=Rear"
+        // "MediaType=" has an empty value → dropped; "=noval" empty key.
+        #expect(CupsOptionsFilter.filter(raw) == "InputSlot=Rear")
+    }
+
+    @Test("extractMediaType prefers MediaType then EPIJ_Medi")
+    func extractMedia() {
+        #expect(CupsParsers.extractMediaType(
+            fromOptionsString: "MediaType=Photo EPIJ_Medi=1") == "Photo")
+        #expect(CupsParsers.extractMediaType(
+            fromOptionsString: "EPIJ_Medi=7") == "7")
+        #expect(CupsParsers.extractMediaType(
+            fromOptionsString: "PageSize=A4") == nil)
+    }
+}
+
+/// Issue 14 — the dlsym attempt order and first-success semantics.
+/// A fake resolver records every call; no private symbols are touched.
+@Suite("ColorSyncSuppressor")
+@MainActor
+struct ColorSyncSuppressorTests {
+
+    /// Fake PMPrintSession — the injected resolver never dereferences it.
+    private var fakeSession: PMPrintSession {
+        unsafeBitCast(UnsafeMutableRawPointer(bitPattern: 0xdead)!, to: PMPrintSession.self)
+    }
+
+    private func suppressor(
+        succeeding symbol: String? = nil,
+        mode: String = "AP_ApplicationColorMatching",
+        calls: UnsafeMutablePointer<[(String, String)]>
+    ) -> ColorSyncSuppressor {
+        var s = ColorSyncSuppressor()
+        s.log = { _ in }
+        s.modeResolver = { name in
+            // Missing symbol → nil (older macOS path).
+            if name == "PMSessionSetColorMatchingModeLock" && symbol == nil {
+                return nil
+            }
+            return { _, modeArg in
+                calls.pointee.append((name, modeArg as String))
+                return (name == symbol && (modeArg as String) == mode) ? 0 : 1
+            }
+        }
+        return s
+    }
+
+    @Test("Attempt order: Lock → Mode → NoLock, AP_ prefix first")
+    func attemptOrder() {
+        let calls = UnsafeMutablePointer<[(String, String)]>.allocate(capacity: 1)
+        calls.initialize(to: [])
+        defer { calls.deallocate() }
+
+        let s = suppressor(succeeding: nil, calls: calls)
+        #expect(s.applySPIMode(to: fakeSession) == false)
+        #expect(calls.pointee == ColorMatchingAttempts.attempts
+            .map { ($0.symbol, $0.mode) }
+            .filter { $0.0 != "PMSessionSetColorMatchingModeLock" })
+    }
+
+    @Test("First zero wins — later symbols not called")
+    func firstZeroWins() {
+        let calls = UnsafeMutablePointer<[(String, String)]>.allocate(capacity: 1)
+        calls.initialize(to: [])
+        defer { calls.deallocate() }
+
+        let s = suppressor(
+            succeeding: "PMSessionSetColorMatchingMode", calls: calls)
+        #expect(s.applySPIMode(to: fakeSession))
+        // Lock symbol missing → skipped; Mode tried AP_ then plain? No —
+        // Mode succeeds on the first mode → 2 calls total.
+        #expect(calls.pointee == [
+            ("PMSessionSetColorMatchingMode", "AP_ApplicationColorMatching"),
+        ])
+        // NoLock never attempted.
+        #expect(!calls.pointee.contains { $0.0 == "PMSessionSetColorMatchingModeNoLock" })
+    }
+
+    @Test("Mode fallback: AP_ rejected → ApplicationColorMatching tried")
+    func modeFallback() {
+        let calls = UnsafeMutablePointer<[(String, String)]>.allocate(capacity: 1)
+        calls.initialize(to: [])
+        defer { calls.deallocate() }
+
+        var s = suppressor(
+            succeeding: "PMSessionSetColorMatchingModeLock",
+            mode: "ApplicationColorMatching",
+            calls: calls)
+        // Make the Lock symbol resolvable this time.
+        let record: (String) -> ColorMatchingModeFunction? = { name in
+            { _, modeArg in
+                calls.pointee.append((name, modeArg as String))
+                return (modeArg as String) == "ApplicationColorMatching" ? 0 : 1
+            }
+        }
+        s.modeResolver = record
+        #expect(s.applySPIMode(to: fakeSession))
+        #expect(calls.pointee.first
+            == ("PMSessionSetColorMatchingModeLock", "AP_ApplicationColorMatching"))
+        #expect(calls.pointee.last
+            == ("PMSessionSetColorMatchingModeLock", "ApplicationColorMatching"))
+    }
+
+    @Test("All symbols missing → false, no calls")
+    func allMissing() {
+        let calls = UnsafeMutablePointer<[(String, String)]>.allocate(capacity: 1)
+        calls.initialize(to: [])
+        defer { calls.deallocate() }
+        var s = suppressor(succeeding: nil, calls: calls)
+        s.modeResolver = { _ in nil }
+        #expect(s.applySPIMode(to: fakeSession) == false)
+        #expect(calls.pointee.isEmpty)
+    }
+}

Tests/ICCeryCoreTests/CupsParserTests.swift

@@ -0,0 +1,149 @@
+import Testing
+import Foundation
+@testable import ICCeryCore
+
+/// Issue 12 — CUPS enumeration parsers on recorded fixtures
+/// (docs/10–11). No live `lpstat`/`lpoptions` is spawned here.
+@Suite("CupsParsers")
+struct CupsParsersTests {
+
+    // Recorded on an Epson XP-55 + Canon Pro9500 host.
+    private let lpstatE = """
+        Canon_Pro9500_II_series_XPS
+        Epson_XP_55_LPD
+        EPSON_XP_55_Series
+        """
+
+    private let lpstatP = """
+        printer Canon_Pro9500_II_series_XPS is idle.  enabled since Mon Sep  7 22:51:30 2026
+        printer Epson_XP_55_LPD now printing Epson_XP_55_LPD-42.  enabled since Mon Sep  7 21:50:25 2026
+        printer EPSON_XP_55_Series disabled since Tue Sep  8 09:00:00 2026 -
+        	Paused
+        """
+
+    private let lpoptionsP = """
+        device-uri=ipp://EPSON%20XP-55%20Series._ipp._tcp.local./ printer-info='EPSON XP-55 Series' printer-location printer-make-and-model='EPSON EPSON XP-55 Series' printer-type=16781340
+        """
+
+    private let lpoptionsL = """
+        PageSize/Media Size: 3.5x5 4x6 5x7 8x10 *A4 A5 B5 Letter Legal Custom.WIDTHxHEIGHT
+        InputSlot/Media Source: Auto *Main Photo Rear
+        MediaType/Media Type: *Stationery PhotographicHighGloss Photographic PhotographicMatte Envelope
+        ColorModel/Output Mode: *RGB Gray
+        Duplex/Duplex: *None DuplexNoTumble DuplexTumble
+        cupsPrintQuality/cupsPrintQuality: Draft *Normal High
+        """
+
+    @Test("lpstat -e: one destination per line; empty = success")
+    func destinations() {
+        #expect(CupsParsers.lpstatDestinations(lpstatE) == [
+            "Canon_Pro9500_II_series_XPS",
+            "Epson_XP_55_LPD",
+            "EPSON_XP_55_Series",
+        ])
+        #expect(CupsParsers.lpstatDestinations("") == [])
+    }
+
+    @Test("lpstat -p: idle / now-printing / disabled statuses")
+    func statuses() {
+        let s = CupsParsers.lpstatStatuses(lpstatP)
+        #expect(s["Canon_Pro9500_II_series_XPS"] == .idle)
+        #expect(s["Epson_XP_55_LPD"] == .printing)
+        #expect(s["EPSON_XP_55_Series"] == .stopped)
+    }
+
+    @Test("lpstat -d: default destination or none")
+    func defaultDestination() {
+        #expect(CupsParsers.lpstatDefault(
+            "system default destination: Canon_Pro9500_II_series_XPS\n")
+            == "Canon_Pro9500_II_series_XPS")
+        #expect(CupsParsers.lpstatDefault("no system default destination\n") == nil)
+    }
+
+    @Test("lpoptions -p: quoted printer-info, bare flags ignored")
+    func displayName() {
+        #expect(CupsParsers.lpoptionsDisplayName(lpoptionsP) == "EPSON XP-55 Series")
+        #expect(CupsParsers.lpoptionsDisplayName("printer-type=42\n") == nil)
+    }
+
+    @Test("lpoptions -l: key/label split, * marks the default")
+    func optionListings() {
+        let listings = CupsParsers.lpoptionsList(lpoptionsL)
+        #expect(listings.count == 6)
+
+        let page = listings[0]
+        #expect(page.key == "PageSize")
+        #expect(page.label == "Media Size")
+        #expect(page.defaultChoice == "A4")
+        #expect(page.choices.contains("Custom.WIDTHxHEIGHT"))
+        #expect(!page.choices.contains("*A4"))
+
+        let slot = listings[1]
+        #expect(slot.key == "InputSlot")
+        #expect(slot.choices == ["Auto", "Main", "Photo", "Rear"])
+        #expect(slot.defaultChoice == "Main")
+    }
+
+    @Test("capabilities: trays/sizes index 1-based, media uses detected key")
+    func capabilities() {
+        let service = CupsService()
+        let listings = CupsParsers.lpoptionsList(lpoptionsL)
+        let caps = service.capabilities(from: listings, ppd: nil)
+
+        #expect(caps.trays == [
+            PrinterTray(id: 1, name: "Auto"),
+            PrinterTray(id: 2, name: "Main"),
+            PrinterTray(id: 3, name: "Photo"),
+            PrinterTray(id: 4, name: "Rear"),
+        ])
+        #expect(caps.paperSizes.first == PrinterPaperSize(id: 1, name: "3.5x5"))
+        #expect(caps.paperSizes.count == 10)
+        #expect(caps.mediaTypes.map(\.id) == [
+            "Stationery", "PhotographicHighGloss", "Photographic",
+            "PhotographicMatte", "Envelope",
+        ])
+        #expect(caps.supportsOrientation)
+    }
+
+    @Test("PPD enrichment maps id → human label")
+    func ppdLabels() {
+        let ppd = """
+            *CNIJMediaType 42/Photo Paper Plus Semi-gloss: "<</MediaType(42)>>"
+            *CNIJMediaType 0/Plain Paper: ""
+            *en_US.CNIJMediaType 13/Envelope: ""
+            """
+        let labels = CupsParsers.ppdChoiceLabels(ppd, key: "CNIJMediaType")
+        #expect(labels["42"] == "Photo Paper Plus Semi-gloss")
+        #expect(labels["0"] == "Plain Paper")
+        #expect(labels["13"] == "Envelope")
+    }
+
+    @Test("detectMediaTypeKey prefers vendor keys in order")
+    func mediaTypeKey() {
+        #expect(CupsParsers.detectMediaTypeKey(
+            optionKeys: ["MediaType", "CNIJMediaType"]) == "CNIJMediaType")
+        #expect(CupsParsers.detectMediaTypeKey(
+            optionKeys: ["PageSize", "MediaType"]) == "MediaType")
+        #expect(CupsParsers.detectMediaTypeKey(optionKeys: ["PageSize"]) == nil)
+    }
+
+    @Test("Driver bypass: Canon Intent2 > Intent; Epson CCor > CMat")
+    func driverBypass() {
+        #expect(CupsParsers.detectDriverColorBypass(
+            optionKeys: ["CNIJIntent2", "CNIJIntent"])
+            == ("CNIJIntent2", "4"))
+        #expect(CupsParsers.detectDriverColorBypass(optionKeys: ["CNIJIntent"])
+            == ("CNIJIntent", "4"))
+        #expect(CupsParsers.detectDriverColorBypass(
+            optionKeys: ["EPIJ_CCor", "EPIJ_CMat"]) == ("EPIJ_CCor", "0"))
+        #expect(CupsParsers.detectDriverColorBypass(optionKeys: ["EPIJ_CMat"])
+            == ("EPIJ_CMat", "3"))
+        #expect(CupsParsers.detectDriverColorBypass(
+            optionKeys: ["StpColorCorrection"]) == ("StpColorCorrection", "Uncorrected"))
+        #expect(CupsParsers.detectDriverColorBypass(
+            optionKeys: ["ColorCorrection"]) == ("ColorCorrection", "Uncorrected"))
+        #expect(CupsParsers.detectDriverColorBypass(
+            optionKeys: ["EpsonColorMode"]) == ("EpsonColorMode", "Off"))
+        #expect(CupsParsers.detectDriverColorBypass(optionKeys: ["PageSize"]) == nil)
+    }
+}

Tests/ICCeryCoreTests/LpArgsTests.swift

@@ -0,0 +1,129 @@
+import Testing
+import Foundation
+@testable import ICCeryCore
+
+/// Issue 15 — `lp` argv goldens (docs/11 `build_lp_args`).
+/// `-d`/`options`/`-t` handling is in `CupsService`; these tests cover
+/// flag order, captured-option precedence, and sanitisation.
+@Suite("LpArgs")
+struct LpArgsTests {
+
+    private let tiff = "/tmp/work/target_001.tif"
+    private let queue = "EPSON_XP_55_Series"
+
+    private func build(
+        options: PrintOptions = PrintOptions(),
+        optionKeys: Set<String> = []
+    ) throws -> [String] {
+        try LpArgs.build(
+            queue: queue, tiffPath: tiff,
+            options: options, optionKeys: optionKeys)
+    }
+
+    @Test("Header: -d queue -t title, both AP_* first, TIFF last")
+    func header() throws {
+        let argv = try build()
+        #expect(Array(argv[0...1]) == ["-d", queue])
+        #expect(Array(argv[2...3]) == ["-t", "ICCery Target - target_001.tif"])
+        #expect(Array(argv[4...5])
+            == ["-o", "AP_ColorMatchingMode=AP_ApplicationColorMatching"])
+        #expect(Array(argv[6...7])
+            == ["-o", "AP.ColorMatchingMode=AP_ApplicationColorMatching"])
+        #expect(argv.last == tiff)
+        #expect(!argv.contains { $0 == "raw" || $0 == "-o raw" })
+    }
+
+    @Test("Never emits -o raw; captured raw= is dropped")
+    func neverRaw() throws {
+        let argv = try build(options: PrintOptions(
+            cupsOptions: "raw=true MediaType=Photo"))
+        for (i, arg) in argv.enumerated() where arg == "-o" {
+            #expect(argv[i + 1] != "raw")
+            #expect(argv[i + 1] != "raw=true")
+        }
+        #expect(!argv.contains { $0.hasPrefix("raw=") })
+        #expect(argv.contains("MediaType=Photo"))
+    }
+
+    @Test("Captured options replayed after AP_* headers")
+    func capturedReplay() throws {
+        let argv = try build(options: PrintOptions(
+            cupsOptions: "InputSlot=Rear MediaType=Photo"))
+        let rear = argv.firstIndex(of: "InputSlot=Rear")!
+        let apFirst = argv.firstIndex(of:
+            "AP_ColorMatchingMode=AP_ApplicationColorMatching")!
+        #expect(rear > apFirst)
+    }
+
+    @Test("Captured wins: media key present → derived media skipped")
+    func capturedWinsMedia() throws {
+        let argv = try build(
+            options: PrintOptions(
+                mediaType: "Plain",
+                cupsOptions: "MediaType=Glossy"),
+            optionKeys: ["MediaType"])
+        #expect(argv.contains("MediaType=Glossy"))
+        #expect(!argv.contains("MediaType=Plain"))
+    }
+
+    @Test("Media emitted via detected key when not captured")
+    func mediaDerived() throws {
+        let argv = try build(
+            options: PrintOptions(mediaType: "SemiGloss"),
+            optionKeys: ["CNIJMediaType", "MediaType"])
+        // CNIJMediaType wins over MediaType in detection order.
+        #expect(argv.contains("CNIJMediaType=SemiGloss"))
+        #expect(!argv.contains("MediaType=SemiGloss"))
+    }
+
+    @Test("Driver bypass emitted when absent, skipped when captured")
+    func bypassRules() throws {
+        let withBypass = try build(
+            optionKeys: ["EPIJ_CMat"])
+        #expect(withBypass.contains("EPIJ_CMat=3"))
+
+        let captured = try build(
+            options: PrintOptions(cupsOptions: "EPIJ_CMat=1"),
+            optionKeys: ["EPIJ_CMat"])
+        // Captured value kept, detection not re-applied.
+        #expect(captured.filter { $0.hasPrefix("EPIJ_CMat") }
+            == ["EPIJ_CMat=1"])
+    }
+
+    @Test("Orientation: portrait=3 landscape=4; captured wins")
+    func orientation() throws {
+        #expect(try build(options: PrintOptions(orientation: "portrait"))
+            .contains("orientation-requested=3"))
+        #expect(try build(options: PrintOptions(orientation: "landscape"))
+            .contains("orientation-requested=4"))
+        #expect(!try build(options: PrintOptions(
+            orientation: "landscape",
+            cupsOptions: "orientation-requested=5"))
+            .contains("orientation-requested=4"))
+    }
+
+    @Test("PageSize emitted unless captured")
+    func pageSize() throws {
+        #expect(try build(options: PrintOptions(paperSize: "A4"))
+            .contains("PageSize=A4"))
+        #expect(!try build(options: PrintOptions(
+            paperSize: "A4", cupsOptions: "PageSize=Letter"))
+            .contains("PageSize=A4"))
+    }
+
+    @Test("Sanitise rejects `;`, newline, and shell metachars")
+    func sanitise() throws {
+        #expect(throws: LpArgsError.self) {
+            _ = try build(options: PrintOptions(
+                cupsOptions: "InputSlot=Rear;rm -rf /"))
+        }
+        #expect(throws: LpArgsError.self) {
+            _ = try build(options: PrintOptions(
+                cupsOptions: "InputSlot=Rear\nMediaType=Photo"))
+        }
+        #expect(throws: LpArgsError.self) {
+            _ = try build(options: PrintOptions(
+                cupsOptions: "InputSlot=$(whoami)"))
+        }
+    }
+}

Tests/ICCeryCoreTests/PrintPanelTests.swift

@@ -0,0 +1,71 @@
+import Testing
+import Foundation
+@testable import ICCeryCore
+@testable import ICCery
+
+/// Issue 13 — panel outcome mapping (cancel → nil, ok → result).
+/// The real `NSPrintPanel` is never run in tests; these exercise the
+/// `UITestHooks` seam the UI tests rely on.
+@Suite("PrintPanelStub")
+struct PrintPanelStubTests {
+
+    private func withEnv(
+        _ vars: [String: String?],
+        _ body: () throws -> Void
+    ) rethrows {
+        var saved: [String: String?] = [:]
+        for key in vars.keys {
+            saved[key] = ProcessInfo.processInfo.environment[key]
+        }
+        for (key, value) in vars {
+            if let value { setenv(key, value, 1) } else { unsetenv(key) }
+        }
+        defer {
+            for (key, value) in saved {
+                if let value { setenv(key, value, 1) } else { unsetenv(key) }
+            }
+        }
+        try body()
+    }
+
+    @Test("Cancel returns nil — not an error")
+    func cancelIsNil() throws {
+        try withEnv([
+            "ICCERY_UI_TESTING": "1",
+            "ICCERY_TEST_PRINT_PANEL": "cancel",
+        ]) {
+            #expect(UITestHooks.printPanelStubbed)
+            #expect(UITestHooks.printPanelResult(forQueue: "q") == nil)
+        }
+    }
+
+    @Test("OK returns captured options + selected printer")
+    func okResult() throws {
+        try withEnv([
+            "ICCERY_UI_TESTING": "1",
+            "ICCERY_TEST_PRINT_PANEL": "ok",
+            "ICCERY_TEST_PANEL_OPTIONS": "MediaType=Photo InputSlot=Rear",
+            "ICCERY_TEST_PANEL_PRINTER": "Other_Queue",
+        ]) {
+            let result = UITestHooks.printPanelResult(forQueue: "q")
+            #expect(result?.selectedPrinter == "Other_Queue")
+            #expect(result?.options.cupsOptions == "MediaType=Photo InputSlot=Rear")
+            #expect(result?.options.mediaType == "Photo")
+            #expect(result?.options.ppdUncorrectedPassthrough == true)
+        }
+    }
+
+    @Test("OK defaults selected printer to the opened queue")
+    func okDefaultsPrinter() throws {
+        try withEnv([
+            "ICCERY_UI_TESTING": "1",
+            "ICCERY_TEST_PRINT_PANEL": "ok",
+            "ICCERY_TEST_PANEL_OPTIONS": nil,
+            "ICCERY_TEST_PANEL_PRINTER": nil,
+        ]) {
+            let result = UITestHooks.printPanelResult(forQueue: "My_Queue")
+            #expect(result?.selectedPrinter == "My_Queue")
+            #expect(result?.options.cupsOptions == nil)
+        }
+    }
+}