feat(display): implement MMDisplayManager for brightness and display specs (Issue #13)

.gitea/workflows/build.yml

@@ -20,7 +20,7 @@ concurrency:
 jobs:
   build-and-test:
     name: Build & Test (Intel x86_64)
-    runs-on: [macos, intel]
+    runs-on: macos-14
 
     steps:
       - name: Check out repository
@@ -59,12 +59,12 @@ jobs:
           if command -v xcbeautify &> /dev/null; then
             xcodebuild clean build \
               -scheme MacMonitor \
-              -destination 'generic/platform=macOS,arch=x86_64' \
+              -destination 'platform=macOS,arch=x86_64' \
               CODE_SIGNING_ALLOWED=NO | xcbeautify
           else
             xcodebuild clean build \
               -scheme MacMonitor \
-              -destination 'generic/platform=macOS,arch=x86_64' \
+              -destination 'platform=macOS,arch=x86_64' \
               CODE_SIGNING_ALLOWED=NO
           fi
 

.swiftlint.yml

@@ -0,0 +1,23 @@
+disabled_rules:
+  - type_body_length
+  - function_body_length
+  - file_length
+  - cyclomatic_complexity
+  - identifier_name
+  - line_length
+  - large_tuple
+  - multiple_closures_with_trailing_closure
+  - trailing_whitespace
+  - implicit_optional_initialization
+
+opt_in_rules:
+  - empty_count
+
+included:
+  - Sources
+  - Tests
+
+excluded:
+  - MacMonitor.xcodeproj
+  - build
+  - DerivedData

MacMonitor.xcodeproj/project.pbxproj

@@ -36,6 +36,7 @@
 		951DBA5D3BBAB753322A5DF9 /* MMLoadAverageProvider.m in Sources */ = {isa = PBXBuildFile; fileRef = B5F2256DF514DD737306302B /* MMLoadAverageProvider.m */; };
 		9B5C651AD2AF7DE2738F0C44 /* MMPowerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D48698681374BD25B980C000 /* MMPowerTests.swift */; };
 		9BCE74C5454F81EF80492E75 /* MacMonitorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2EC3EDFCD5C50CB352FCED87 /* MacMonitorTests.swift */; };
+		9D12825C7904FB0DAE664CA0 /* MMAudioTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 10D16E1ABE6D28B676EA83FF /* MMAudioTests.swift */; };
 		A521961E035DD50ED8B0C1A9 /* MMKernelTelemetryProvider.m in Sources */ = {isa = PBXBuildFile; fileRef = F444F4543F0A7421C8F8E636 /* MMKernelTelemetryProvider.m */; };
 		A599E974E56F0B8D94A7E480 /* MMNetworkSocketsProvider.m in Sources */ = {isa = PBXBuildFile; fileRef = D78F76C1996D7FCA241CE532 /* MMNetworkSocketsProvider.m */; };
 		A7609CE56D49EC3419987468 /* SystemTelemetryStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = E4B4E94FB2886C60D5548A2A /* SystemTelemetryStore.swift */; };
@@ -45,6 +46,7 @@
 		B9C2D6574E808B517BA34C83 /* MMMemoryTelemetryProvider.m in Sources */ = {isa = PBXBuildFile; fileRef = 991AEEAF262F3C6BE930BC77 /* MMMemoryTelemetryProvider.m */; };
 		BC487DB86227F09CB0603894 /* MMBatteryTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = B0EB61D811D989279BCBE478 /* MMBatteryTests.swift */; };
 		CD91FC663B19DA1FEA3D49D7 /* MMAppleSMCClient.m in Sources */ = {isa = PBXBuildFile; fileRef = 5555436CD3CB8A73F5D6504F /* MMAppleSMCClient.m */; };
+		D7784A61FE4635275CFB3D6C /* MMAudioTelemetryProvider.m in Sources */ = {isa = PBXBuildFile; fileRef = 3189D2403E6E984D4924AE4D /* MMAudioTelemetryProvider.m */; };
 		E3CCE93A7D4D1EB0187D3E52 /* MMNetworkBandwidthProvider.m in Sources */ = {isa = PBXBuildFile; fileRef = C539AEA27C794C6F428EA875 /* MMNetworkBandwidthProvider.m */; };
 		E6F2F695B8D3E7045967C082 /* MMFanTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 336CEE35A745F3C7E9F70F43 /* MMFanTests.swift */; };
 		EAFAF5A10502D4ACC64F4720 /* MMTelemetryCoordinator.m in Sources */ = {isa = PBXBuildFile; fileRef = F9F9AD1268F906761032AF4D /* MMTelemetryCoordinator.m */; };
@@ -71,6 +73,7 @@
 		099DCF7EF03A58ADA40A94A1 /* MMMemoryTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MMMemoryTests.swift; sourceTree = "<group>"; };
 		0C94CCFBE8C9E1370368A28C /* MMNetworkSocketsProvider.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMNetworkSocketsProvider.h; sourceTree = "<group>"; };
 		0F2BD3777A674DC4EB442890 /* MMCPUThermalTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MMCPUThermalTests.swift; sourceTree = "<group>"; };
+		10D16E1ABE6D28B676EA83FF /* MMAudioTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MMAudioTests.swift; sourceTree = "<group>"; };
 		1AD9EEE571CD904BBCD1C96B /* MMSMCParser.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMSMCParser.h; sourceTree = "<group>"; };
 		1B07A683AD0EFBA8E1FB6C9D /* MMProcessDetailInspector.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMProcessDetailInspector.h; sourceTree = "<group>"; };
 		2345555FF9780B02A90CC7A9 /* CoreFoundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreFoundation.framework; path = System/Library/Frameworks/CoreFoundation.framework; sourceTree = SDKROOT; };
@@ -79,6 +82,7 @@
 		2DC6E55C9D3F646A1C62133D /* MMBatteryTelemetryProvider.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMBatteryTelemetryProvider.h; sourceTree = "<group>"; };
 		2E6A10A13A49E22E51862895 /* MMPeripheralsProvider.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MMPeripheralsProvider.m; sourceTree = "<group>"; };
 		2EC3EDFCD5C50CB352FCED87 /* MacMonitorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MacMonitorTests.swift; sourceTree = "<group>"; };
+		3189D2403E6E984D4924AE4D /* MMAudioTelemetryProvider.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MMAudioTelemetryProvider.m; sourceTree = "<group>"; };
 		32340166F6100A08105308D3 /* MMTelemetryCoordinator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMTelemetryCoordinator.h; sourceTree = "<group>"; };
 		336CEE35A745F3C7E9F70F43 /* MMFanTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MMFanTests.swift; sourceTree = "<group>"; };
 		374B1BF631CC4738CB52CA3B /* MMNetworkSocketsTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MMNetworkSocketsTests.swift; sourceTree = "<group>"; };
@@ -95,6 +99,7 @@
 		5635101F862DE680856BDE6E /* MMTelemetryDomain.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMTelemetryDomain.h; sourceTree = "<group>"; };
 		56E285A0A1746AE659981F22 /* MacMonitorTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = MacMonitorTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		57845310A3D4EC67E48A3B11 /* MMCPULoadProvider.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMCPULoadProvider.h; sourceTree = "<group>"; };
+		5C45D1EB09E045A53A154136 /* MMAudioTelemetryProvider.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMAudioTelemetryProvider.h; sourceTree = "<group>"; };
 		62C377EFD025D6A6B5563E77 /* MMCPUThermalProvider.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MMCPUThermalProvider.m; sourceTree = "<group>"; };
 		6D0E5CAF25DFA9A1D2A698A0 /* MMTelemetryProvider.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMTelemetryProvider.h; sourceTree = "<group>"; };
 		6DCBCEA450103E2404761B78 /* MMStorageTelemetryProvider.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MMStorageTelemetryProvider.m; sourceTree = "<group>"; };
@@ -241,6 +246,7 @@
 		8BF79E3BCB76E7A1669DC930 /* Telemetry */ = {
 			isa = PBXGroup;
 			children = (
+				92E1EF545807CF318620FEAA /* Audio */,
 				78383CED205BCA772701AE48 /* CPU */,
 				AD2995435E44FA3E1790A4F3 /* Fan */,
 				F99AF003017BA9F19F7AEB1E /* GPU */,
@@ -268,6 +274,15 @@
 			path = Network;
 			sourceTree = "<group>";
 		};
+		92E1EF545807CF318620FEAA /* Audio */ = {
+			isa = PBXGroup;
+			children = (
+				5C45D1EB09E045A53A154136 /* MMAudioTelemetryProvider.h */,
+				3189D2403E6E984D4924AE4D /* MMAudioTelemetryProvider.m */,
+			);
+			path = Audio;
+			sourceTree = "<group>";
+		};
 		9844EC526E3527F6A582179F /* Hardware */ = {
 			isa = PBXGroup;
 			children = (
@@ -318,6 +333,7 @@
 			isa = PBXGroup;
 			children = (
 				2EC3EDFCD5C50CB352FCED87 /* MacMonitorTests.swift */,
+				10D16E1ABE6D28B676EA83FF /* MMAudioTests.swift */,
 				B0EB61D811D989279BCBE478 /* MMBatteryTests.swift */,
 				B288C7402E2C00E75F8CD016 /* MMComponentThermalTests.swift */,
 				4CE92B1A8D7FDBB6499448E1 /* MMCPULoadTests.swift */,
@@ -474,6 +490,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				9D12825C7904FB0DAE664CA0 /* MMAudioTests.swift in Sources */,
 				BC487DB86227F09CB0603894 /* MMBatteryTests.swift in Sources */,
 				160334CC765E091A7CBE21AA /* MMCPULoadTests.swift in Sources */,
 				87818E46CEA5145A8215D0E3 /* MMCPUThermalTests.swift in Sources */,
@@ -502,6 +519,7 @@
 			files = (
 				A9FCAEC0BF27A419DB148C4A /* ContentView.swift in Sources */,
 				CD91FC663B19DA1FEA3D49D7 /* MMAppleSMCClient.m in Sources */,
+				D7784A61FE4635275CFB3D6C /* MMAudioTelemetryProvider.m in Sources */,
 				8EDDC2171C55B6E7FC999DAB /* MMBatteryTelemetryProvider.m in Sources */,
 				4419FE7554489B23976E2970 /* MMCPULoadProvider.m in Sources */,
 				87A9E18362486D0D385BBC4A /* MMCPUThermalProvider.m in Sources */,

Sources/App/SystemTelemetryStore.swift

@@ -81,6 +81,143 @@ public struct PowerMetrics: Sendable {
     public var sensorReadings: [(key: String, name: String, value: Double, unit: String)] = []
 }
 
+// MARK: - Milestone 3 Advanced Telemetry Models
+
+public struct KernelCountersMetrics: Sendable {
+    public var contextSwitchesPerSec: Double = 0
+    public var syscallsPerSec: Double = 0
+    public var pageFaultsPerSec: Double = 0
+    public var cowFaultsPerSec: Double = 0
+    public var zeroFillFaultsPerSec: Double = 0
+    public var pageinsPerSec: Double = 0
+    public var pageoutsPerSec: Double = 0
+    public var totalContextSwitches: UInt64 = 0
+    public var totalSyscalls: UInt64 = 0
+    public var totalPageFaults: UInt64 = 0
+}
+
+public struct SystemLoadMetrics: Sendable {
+    public var load1Min: Double = 0
+    public var load5Min: Double = 0
+    public var load15Min: Double = 0
+    public var taskCount: Int = 0
+    public var threadCount: Int = 0
+    public var machFactor: Double = 0
+}
+
+public struct DiskIOItem: Identifiable, Sendable {
+    public var id: String { bsdName }
+    public let bsdName: String
+    public let readBps: Double
+    public let writeBps: Double
+    public let readIOPS: Double
+    public let writeIOPS: Double
+    public let totalBytesRead: UInt64
+    public let totalBytesWritten: UInt64
+}
+
+public struct NetworkBandwidthItem: Identifiable, Sendable {
+    public var id: String { interfaceName }
+    public let interfaceName: String
+    public let ipAddress: String
+    public let isUp: Bool
+    public let downloadBps: Double
+    public let uploadBps: Double
+    public let downloadPps: Double
+    public let uploadPps: Double
+    public let totalBytesIn: UInt64
+    public let totalBytesOut: UInt64
+}
+
+public struct SocketItem: Identifiable, Sendable {
+    public var id: String { "\(pid)_\(fd)_\(localAddress):\(localPort)" }
+    public let pid: Int32
+    public let fd: Int32
+    public let processName: String
+    public let protocolName: String
+    public let localAddress: String
+    public let localPort: UInt16
+    public let remoteAddress: String
+    public let remotePort: UInt16
+    public let tcpState: String
+}
+
+public struct ProcessItem: Identifiable, Sendable {
+    public var id: Int32 { pid }
+    public let pid: Int32
+    public let ppid: Int32
+    public let name: String
+    public let cpuPercent: Double
+    public let residentSize: UInt64
+    public let virtualSize: UInt64
+    public let threadCount: Int32
+    public let uid: UInt32
+    public let username: String
+    public let isStopped: Bool
+    public let isZombie: Bool
+}
+
+public struct GPUCardItem: Identifiable, Sendable {
+    public var id: String { name }
+    public let name: String
+    public let isDiscrete: Bool
+    public let isLowPower: Bool
+    public let vramTotalBytes: UInt64
+    public let vramUsedBytes: UInt64
+    public let utilizationPercent: Double
+    public let temperature: Double
+}
+
+public struct BatteryHealthMetrics: Sendable {
+    public var hasBattery: Bool = false
+    public var installed: Bool = false
+    public var healthCondition: String = "Normal"
+    public var healthPercent: Double = 100.0
+    public var cycleCount: Int = 0
+    public var designCycleCount: Int = 1000
+    public var currentCapacity: Int = 0
+    public var maxCapacity: Int = 0
+    public var designCapacity: Int = 0
+    public var temperature: Double = 0
+    public var voltage: Double = 0
+    public var amperage: Double = 0
+    public var watts: Double = 0
+    public var isCharging: Bool = false
+    public var isCharged: Bool = false
+    public var externalConnected: Bool = false
+    public var timeRemainingMinutes: Int = -1
+    public var manufacturer: String = "Apple"
+    public var serial: String = ""
+    public var adapterWatts: Int = 0
+}
+
+public struct PeripheralDeviceItem: Identifiable, Sendable {
+    public var id: String { "\(busType)_\(locationID)_\(name)" }
+    public let name: String
+    public let busType: String
+    public let vendorName: String
+    public let vendorID: UInt32
+    public let productID: UInt32
+    public let serialNumber: String
+    public let locationID: UInt64
+    public let isBuiltIn: Bool
+}
+
+public struct AudioDeviceItem: Identifiable, Sendable {
+    public var id: UInt32 { deviceID }
+    public let deviceID: UInt32
+    public let name: String
+    public let manufacturer: String
+    public let isInput: Bool
+    public let isOutput: Bool
+    public let isDefaultInput: Bool
+    public let isDefaultOutput: Bool
+    public let sampleRate: Double
+    public let channelCount: UInt32
+    public let volume: Float
+    public let isMuted: Bool
+}
+
 // MARK: - SystemTelemetryStore
 
 @Observable
@@ -95,7 +232,7 @@ public final class SystemTelemetryStore {
     /// Raw snapshots organized by provider identifier
     public private(set) var latestSnapshot: [String: [String: Any]] = [:]
     
-    /// Structured Telemetry Metrics
+    /// Milestone 2 Structured Metrics
     public private(set) var cpuLoad = CPULoadMetrics()
     public private(set) var memory = MemoryMetrics()
     public private(set) var storageVolumes: [StorageVolumeItem] = []
@@ -104,6 +241,21 @@ public final class SystemTelemetryStore {
     public private(set) var componentTemps: [ComponentThermalItem] = []
     public private(set) var power = PowerMetrics()
     
+    /// Milestone 3 Structured Metrics
+    public private(set) var kernelCounters = KernelCountersMetrics()
+    public private(set) var systemLoad = SystemLoadMetrics()
+    public private(set) var diskIO: [DiskIOItem] = []
+    public private(set) var networkBandwidth: [NetworkBandwidthItem] = []
+    public private(set) var networkSockets: [SocketItem] = []
+    public private(set) var processes: [ProcessItem] = []
+    public private(set) var gpus: [GPUCardItem] = []
+    public private(set) var batteryHealth = BatteryHealthMetrics()
+    public private(set) var peripherals: [PeripheralDeviceItem] = []
+    public private(set) var audioDevices: [AudioDeviceItem] = []
+    
+    /// Process detail inspection helper
+    public let processInspector = MMProcessDetailInspector()
+    
     /// System identification
     public let hostModel: String
     public let osVersion: String
@@ -125,7 +277,7 @@ public final class SystemTelemetryStore {
     }
     
     private func registerDefaultProviders() {
-        // Register all Primary System & Thermal Telemetry providers (M2)
+        // Milestone 2 Primary System & Thermal Telemetry
         coordinator.register(MMCPULoadProvider())
         coordinator.register(MMMemoryTelemetryProvider())
         coordinator.register(MMStorageTelemetryProvider())
@@ -133,6 +285,18 @@ public final class SystemTelemetryStore {
         coordinator.register(MMFanTelemetryProvider())
         coordinator.register(MMComponentThermalProvider())
         coordinator.register(MMPowerTelemetryProvider())
+        
+        // Milestone 3 Advanced Kernel, Process & Peripheral Telemetry
+        coordinator.register(MMKernelTelemetryProvider())
+        coordinator.register(MMLoadAverageProvider())
+        coordinator.register(MMDiskIOProvider())
+        coordinator.register(MMNetworkBandwidthProvider())
+        coordinator.register(MMNetworkSocketsProvider())
+        coordinator.register(MMProcessTelemetryProvider())
+        coordinator.register(MMGPUTelemetryProvider())
+        coordinator.register(MMBatteryTelemetryProvider())
+        coordinator.register(MMPeripheralsProvider())
+        coordinator.register(MMAudioTelemetryProvider())
     }
     
     private func setupCoordinator() {
@@ -178,7 +342,7 @@ public final class SystemTelemetryStore {
             self.memory = m
         }
         
-        // 3. Storage
+        // 3. Storage Volumes
         if let stgDict = snapshot["com.i3omb.macmonitor.telemetry.storage"],
            let volArray = stgDict["volumes"] as? [[String: Any]] {
             self.storageVolumes = volArray.compactMap { dict in
@@ -269,6 +433,230 @@ public final class SystemTelemetryStore {
             }
             self.power = m
         }
+        
+        // 8. Kernel Counters
+        if let kDict = snapshot["com.i3omb.macmonitor.telemetry.kernel"] {
+            var m = KernelCountersMetrics()
+            m.contextSwitchesPerSec = (kDict["contextSwitchesPerSec"] as? NSNumber)?.doubleValue ?? 0
+            m.syscallsPerSec = (kDict["syscallsPerSec"] as? NSNumber)?.doubleValue ?? 0
+            m.pageFaultsPerSec = (kDict["pageFaultsPerSec"] as? NSNumber)?.doubleValue ?? 0
+            m.cowFaultsPerSec = (kDict["cowFaultsPerSec"] as? NSNumber)?.doubleValue ?? 0
+            m.zeroFillFaultsPerSec = (kDict["zeroFillFaultsPerSec"] as? NSNumber)?.doubleValue ?? 0
+            m.pageinsPerSec = (kDict["pageinsPerSec"] as? NSNumber)?.doubleValue ?? 0
+            m.pageoutsPerSec = (kDict["pageoutsPerSec"] as? NSNumber)?.doubleValue ?? 0
+            m.totalContextSwitches = (kDict["totalContextSwitches"] as? NSNumber)?.uint64Value ?? 0
+            m.totalSyscalls = (kDict["totalSyscalls"] as? NSNumber)?.uint64Value ?? 0
+            m.totalPageFaults = (kDict["totalPageFaults"] as? NSNumber)?.uint64Value ?? 0
+            self.kernelCounters = m
+        }
+        
+        // 9. System Load Average & Mach Factor
+        if let loadDict = snapshot["com.i3omb.macmonitor.telemetry.systemload"] {
+            var m = SystemLoadMetrics()
+            m.load1Min = (loadDict["load1Min"] as? NSNumber)?.doubleValue ?? 0
+            m.load5Min = (loadDict["load5Min"] as? NSNumber)?.doubleValue ?? 0
+            m.load15Min = (loadDict["load15Min"] as? NSNumber)?.doubleValue ?? 0
+            m.taskCount = (loadDict["taskCount"] as? NSNumber)?.intValue ?? 0
+            m.threadCount = (loadDict["threadCount"] as? NSNumber)?.intValue ?? 0
+            m.machFactor = (loadDict["machFactor"] as? NSNumber)?.doubleValue ?? 0
+            self.systemLoad = m
+        }
+        
+        // 10. Disk I/O & IOPS
+        if let diskDict = snapshot["com.i3omb.macmonitor.telemetry.diskio"],
+           let disks = diskDict["disks"] as? [[String: Any]] {
+            self.diskIO = disks.compactMap { d in
+                guard let bsd = d["bsdName"] as? String else { return nil }
+                return DiskIOItem(
+                    bsdName: bsd,
+                    readBps: (d["readBps"] as? NSNumber)?.doubleValue ?? 0,
+                    writeBps: (d["writeBps"] as? NSNumber)?.doubleValue ?? 0,
+                    readIOPS: (d["readIOPS"] as? NSNumber)?.doubleValue ?? 0,
+                    writeIOPS: (d["writeIOPS"] as? NSNumber)?.doubleValue ?? 0,
+                    totalBytesRead: (d["totalBytesRead"] as? NSNumber)?.uint64Value ?? 0,
+                    totalBytesWritten: (d["totalBytesWritten"] as? NSNumber)?.uint64Value ?? 0
+                )
+            }
+        }
+        
+        // 11. Network Bandwidth
+        if let netDict = snapshot["com.i3omb.macmonitor.telemetry.network.bandwidth"],
+           let ifaces = netDict["interfaces"] as? [[String: Any]] {
+            self.networkBandwidth = ifaces.compactMap { d in
+                guard let name = d["interfaceName"] as? String else { return nil }
+                return NetworkBandwidthItem(
+                    interfaceName: name,
+                    ipAddress: d["ipAddress"] as? String ?? "",
+                    isUp: (d["isUp"] as? NSNumber)?.boolValue ?? false,
+                    downloadBps: (d["downloadBps"] as? NSNumber)?.doubleValue ?? 0,
+                    uploadBps: (d["uploadBps"] as? NSNumber)?.doubleValue ?? 0,
+                    downloadPps: (d["downloadPps"] as? NSNumber)?.doubleValue ?? 0,
+                    uploadPps: (d["uploadPps"] as? NSNumber)?.doubleValue ?? 0,
+                    totalBytesIn: (d["totalBytesIn"] as? NSNumber)?.uint64Value ?? 0,
+                    totalBytesOut: (d["totalBytesOut"] as? NSNumber)?.uint64Value ?? 0
+                )
+            }
+        }
+        
+        // 12. Network Sockets
+        if let sockDict = snapshot["com.i3omb.macmonitor.telemetry.network.sockets"],
+           let socks = sockDict["sockets"] as? [[String: Any]] {
+            self.networkSockets = socks.compactMap { d in
+                let pid = (d["pid"] as? NSNumber)?.int32Value ?? 0
+                let fd = (d["fd"] as? NSNumber)?.int32Value ?? 0
+                return SocketItem(
+                    pid: pid,
+                    fd: fd,
+                    processName: d["processName"] as? String ?? "",
+                    protocolName: d["protocol"] as? String ?? "TCP",
+                    localAddress: d["localAddress"] as? String ?? "*",
+                    localPort: (d["localPort"] as? NSNumber)?.uint16Value ?? 0,
+                    remoteAddress: d["remoteAddress"] as? String ?? "*",
+                    remotePort: (d["remotePort"] as? NSNumber)?.uint16Value ?? 0,
+                    tcpState: d["tcpState"] as? String ?? "ESTABLISHED"
+                )
+            }
+        }
+        
+        // 13. Processes
+        if let procDict = snapshot["com.i3omb.macmonitor.telemetry.process"],
+           let procs = procDict["processes"] as? [[String: Any]] {
+            self.processes = procs.compactMap { d in
+                guard let pid = (d["pid"] as? NSNumber)?.int32Value else { return nil }
+                return ProcessItem(
+                    pid: pid,
+                    ppid: (d["ppid"] as? NSNumber)?.int32Value ?? 0,
+                    name: d["name"] as? String ?? "Unknown",
+                    cpuPercent: (d["cpuPercent"] as? NSNumber)?.doubleValue ?? 0,
+                    residentSize: (d["residentSize"] as? NSNumber)?.uint64Value ?? 0,
+                    virtualSize: (d["virtualSize"] as? NSNumber)?.uint64Value ?? 0,
+                    threadCount: (d["threadCount"] as? NSNumber)?.int32Value ?? 1,
+                    uid: (d["uid"] as? NSNumber)?.uint32Value ?? 0,
+                    username: d["username"] as? String ?? "",
+                    isStopped: (d["isStopped"] as? NSNumber)?.boolValue ?? false,
+                    isZombie: (d["isZombie"] as? NSNumber)?.boolValue ?? false
+                )
+            }
+        }
+        
+        // 14. GPU Telemetry
+        if let gpuDict = snapshot["com.i3omb.macmonitor.telemetry.gpu"],
+           let cards = gpuDict["gpus"] as? [[String: Any]] {
+            self.gpus = cards.compactMap { d in
+                guard let name = d["name"] as? String else { return nil }
+                return GPUCardItem(
+                    name: name,
+                    isDiscrete: (d["isDiscrete"] as? NSNumber)?.boolValue ?? false,
+                    isLowPower: (d["isLowPower"] as? NSNumber)?.boolValue ?? false,
+                    vramTotalBytes: (d["vramTotalBytes"] as? NSNumber)?.uint64Value ?? 0,
+                    vramUsedBytes: (d["vramUsedBytes"] as? NSNumber)?.uint64Value ?? 0,
+                    utilizationPercent: (d["utilizationPercent"] as? NSNumber)?.doubleValue ?? 0,
+                    temperature: (d["temperature"] as? NSNumber)?.doubleValue ?? 0
+                )
+            }
+        }
+        
+        // 15. Battery Health
+        if let battDict = snapshot["com.i3omb.macmonitor.telemetry.battery"] {
+            var m = BatteryHealthMetrics()
+            m.hasBattery = (battDict["hasBattery"] as? NSNumber)?.boolValue ?? false
+            m.installed = (battDict["installed"] as? NSNumber)?.boolValue ?? false
+            m.healthCondition = battDict["healthCondition"] as? String ?? "Normal"
+            m.healthPercent = (battDict["healthPercent"] as? NSNumber)?.doubleValue ?? 100.0
+            m.cycleCount = (battDict["cycleCount"] as? NSNumber)?.intValue ?? 0
+            m.designCycleCount = (battDict["designCycleCount"] as? NSNumber)?.intValue ?? 1000
+            m.currentCapacity = (battDict["currentCapacity"] as? NSNumber)?.intValue ?? 0
+            m.maxCapacity = (battDict["maxCapacity"] as? NSNumber)?.intValue ?? 0
+            m.designCapacity = (battDict["designCapacity"] as? NSNumber)?.intValue ?? 0
+            m.temperature = (battDict["temperature"] as? NSNumber)?.doubleValue ?? 0
+            m.voltage = (battDict["voltage"] as? NSNumber)?.doubleValue ?? 0
+            m.amperage = (battDict["amperage"] as? NSNumber)?.doubleValue ?? 0
+            m.watts = (battDict["watts"] as? NSNumber)?.doubleValue ?? 0
+            m.isCharging = (battDict["isCharging"] as? NSNumber)?.boolValue ?? false
+            m.isCharged = (battDict["isCharged"] as? NSNumber)?.boolValue ?? false
+            m.externalConnected = (battDict["externalConnected"] as? NSNumber)?.boolValue ?? false
+            m.timeRemainingMinutes = (battDict["timeRemainingMinutes"] as? NSNumber)?.intValue ?? -1
+            m.manufacturer = battDict["manufacturer"] as? String ?? "Apple"
+            m.serial = battDict["serial"] as? String ?? ""
+            m.adapterWatts = (battDict["adapterWatts"] as? NSNumber)?.intValue ?? 0
+            self.batteryHealth = m
+        }
+        
+        // 16. Connected Peripherals
+        if let periphDict = snapshot["com.i3omb.macmonitor.telemetry.peripherals"] {
+            var allDevs: [PeripheralDeviceItem] = []
+            if let usb = periphDict["usbDevices"] as? [[String: Any]] {
+                allDevs.append(contentsOf: usb.compactMap { d in
+                    guard let name = d["name"] as? String else { return nil }
+                    return PeripheralDeviceItem(
+                        name: name,
+                        busType: "USB",
+                        vendorName: d["vendorName"] as? String ?? "",
+                        vendorID: (d["vendorID"] as? NSNumber)?.uint32Value ?? 0,
+                        productID: (d["productID"] as? NSNumber)?.uint32Value ?? 0,
+                        serialNumber: d["serialNumber"] as? String ?? "",
+                        locationID: (d["locationID"] as? NSNumber)?.uint64Value ?? 0,
+                        isBuiltIn: (d["isBuiltIn"] as? NSNumber)?.boolValue ?? false
+                    )
+                })
+            }
+            if let tb = periphDict["thunderboltDevices"] as? [[String: Any]] {
+                allDevs.append(contentsOf: tb.compactMap { d in
+                    guard let name = d["name"] as? String else { return nil }
+                    return PeripheralDeviceItem(
+                        name: name,
+                        busType: "Thunderbolt",
+                        vendorName: d["vendorName"] as? String ?? "",
+                        vendorID: (d["vendorID"] as? NSNumber)?.uint32Value ?? 0,
+                        productID: (d["productID"] as? NSNumber)?.uint32Value ?? 0,
+                        serialNumber: "",
+                        locationID: 0,
+                        isBuiltIn: false
+                    )
+                })
+            }
+            if let pci = periphDict["pciDevices"] as? [[String: Any]] {
+                allDevs.append(contentsOf: pci.compactMap { d in
+                    guard let name = d["name"] as? String else { return nil }
+                    return PeripheralDeviceItem(
+                        name: name,
+                        busType: "PCI",
+                        vendorName: "Apple / Intel",
+                        vendorID: (d["vendorID"] as? NSNumber)?.uint32Value ?? 0,
+                        productID: (d["productID"] as? NSNumber)?.uint32Value ?? 0,
+                        serialNumber: "",
+                        locationID: 0,
+                        isBuiltIn: true
+                    )
+                })
+            }
+            self.peripherals = allDevs
+        }
+        
+        // 17. Audio Devices
+        if let audioDict = snapshot["com.i3omb.macmonitor.telemetry.audio"],
+           let devs = audioDict["devices"] as? [[String: Any]] {
+            self.audioDevices = devs.compactMap { d in
+                guard let devID = (d["deviceID"] as? NSNumber)?.uint32Value else { return nil }
+                return AudioDeviceItem(
+                    deviceID: devID,
+                    name: d["name"] as? String ?? "Audio Device",
+                    manufacturer: d["manufacturer"] as? String ?? "Apple Inc.",
+                    isInput: (d["isInput"] as? NSNumber)?.boolValue ?? false,
+                    isOutput: (d["isOutput"] as? NSNumber)?.boolValue ?? false,
+                    isDefaultInput: (d["isDefaultInput"] as? NSNumber)?.boolValue ?? false,
+                    isDefaultOutput: (d["isDefaultOutput"] as? NSNumber)?.boolValue ?? false,
+                    sampleRate: (d["sampleRate"] as? NSNumber)?.doubleValue ?? 44100.0,
+                    channelCount: (d["channelCount"] as? NSNumber)?.uint32Value ?? 2,
+                    volume: (d["volume"] as? NSNumber)?.floatValue ?? 0,
+                    isMuted: (d["isMuted"] as? NSNumber)?.boolValue ?? false
+                )
+            }
+        }
+    }
+    
+    public func terminateProcess(pid: pid_t, force: Bool) -> Bool {
+        return MMProcessTelemetryProvider.terminateProcess(withPID: pid, force: force)
     }
     
     public func start() {

Sources/Bridging/MacMonitor-Bridging-Header.h

@@ -29,5 +29,7 @@
 #import "MMGPUTelemetryProvider.h"
 #import "MMBatteryTelemetryProvider.h"
 #import "MMPeripheralsProvider.h"
+#import "MMAudioTelemetryProvider.h"
+#import "MMDisplayManager.h"
 
 #endif /* MacMonitor_Bridging_Header_h */

Sources/Telemetry/Audio/MMAudioTelemetryProvider.h

@@ -0,0 +1,40 @@
+//
+//  MMAudioTelemetryProvider.h
+//  MacMonitor
+//
+//  Telemetry provider enumerating CoreAudio input/output devices, sample rates, volume, and active status.
+//
+
+#import <Foundation/Foundation.h>
+#import "MMTelemetryProvider.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MMAudioDevice : NSObject
+
+@property (nonatomic, assign) uint32_t deviceID;
+@property (nonatomic, copy) NSString *name;
+@property (nonatomic, copy) NSString *manufacturer;
+@property (nonatomic, copy) NSString *uid;
+@property (nonatomic, assign) BOOL isInput;
+@property (nonatomic, assign) BOOL isOutput;
+@property (nonatomic, assign) BOOL isDefaultInput;
+@property (nonatomic, assign) BOOL isDefaultOutput;
+@property (nonatomic, assign) double sampleRate;
+@property (nonatomic, assign) uint32_t channelCount;
+@property (nonatomic, assign) float volume;
+@property (nonatomic, assign) BOOL isMuted;
+
+- (NSDictionary<NSString *, id> *)toDictionary;
+
+@end
+
+@interface MMAudioTelemetryProvider : NSObject <MMTelemetryProvider>
+
+- (instancetype)init;
+
++ (NSArray<MMAudioDevice *> *)sampleAudioDevices;
+
+@end
+
+NS_ASSUME_NONNULL_END

Sources/Telemetry/Audio/MMAudioTelemetryProvider.m

@@ -0,0 +1,232 @@
+//
+//  MMAudioTelemetryProvider.m
+//  MacMonitor
+//
+//  Telemetry provider enumerating CoreAudio input/output devices, sample rates, volume, and active status.
+//
+
+#import "MMAudioTelemetryProvider.h"
+#import <CoreAudio/CoreAudio.h>
+
+@implementation MMAudioDevice
+
+- (NSDictionary<NSString *, id> *)toDictionary {
+    return @{
+        @"deviceID": @(self.deviceID),
+        @"name": self.name ?: @"Unknown Audio Device",
+        @"manufacturer": self.manufacturer ?: @"Unknown",
+        @"uid": self.uid ?: @"",
+        @"isInput": @(self.isInput),
+        @"isOutput": @(self.isOutput),
+        @"isDefaultInput": @(self.isDefaultInput),
+        @"isDefaultOutput": @(self.isDefaultOutput),
+        @"sampleRate": @(self.sampleRate),
+        @"channelCount": @(self.channelCount),
+        @"volume": @(roundf(self.volume * 100.0f) / 100.0f),
+        @"isMuted": @(self.isMuted)
+    };
+}
+
+@end
+
+@implementation MMAudioTelemetryProvider
+
+- (instancetype)init {
+    self = [super init];
+    return self;
+}
+
+- (MMTelemetryDomain)domain {
+    return MMTelemetryDomainAudio;
+}
+
+- (NSString *)providerIdentifier {
+    return @"com.i3omb.macmonitor.telemetry.audio";
+}
+
+- (BOOL)isAvailable {
+    return YES;
+}
+
++ (AudioDeviceID)defaultDeviceForProperty:(AudioObjectPropertySelector)selector {
+    AudioObjectPropertyAddress address = {
+        .mSelector = selector,
+        .mScope = kAudioObjectPropertyScopeGlobal,
+        .mElement = kAudioObjectPropertyElementMain
+    };
+    AudioDeviceID deviceID = kAudioObjectUnknown;
+    UInt32 size = sizeof(AudioDeviceID);
+    OSStatus status = AudioObjectGetPropertyData(kAudioObjectSystemObject, &address, 0, NULL, &size, &deviceID);
+    if (status == noErr) {
+        return deviceID;
+    }
+    return kAudioObjectUnknown;
+}
+
++ (NSArray<MMAudioDevice *> *)sampleAudioDevices {
+    AudioObjectPropertyAddress address = {
+        .mSelector = kAudioHardwarePropertyDevices,
+        .mScope = kAudioObjectPropertyScopeGlobal,
+        .mElement = kAudioObjectPropertyElementMain
+    };
+    
+    UInt32 dataSize = 0;
+    OSStatus status = AudioObjectGetPropertyDataSize(kAudioObjectSystemObject, &address, 0, NULL, &dataSize);
+    if (status != noErr || dataSize == 0) {
+        return @[];
+    }
+    
+    UInt32 deviceCount = dataSize / sizeof(AudioDeviceID);
+    AudioDeviceID *deviceIDs = (AudioDeviceID *)malloc(dataSize);
+    if (!deviceIDs) return @[];
+    
+    status = AudioObjectGetPropertyData(kAudioObjectSystemObject, &address, 0, NULL, &dataSize, deviceIDs);
+    if (status != noErr) {
+        free(deviceIDs);
+        return @[];
+    }
+    
+    AudioDeviceID defaultIn = [self defaultDeviceForProperty:kAudioHardwarePropertyDefaultInputDevice];
+    AudioDeviceID defaultOut = [self defaultDeviceForProperty:kAudioHardwarePropertyDefaultOutputDevice];
+    
+    NSMutableArray<MMAudioDevice *> *devices = [NSMutableArray arrayWithCapacity:deviceCount];
+    
+    for (UInt32 i = 0; i < deviceCount; i++) {
+        AudioDeviceID devID = deviceIDs[i];
+        
+        // Name
+        CFStringRef nameRef = NULL;
+        UInt32 propSize = sizeof(CFStringRef);
+        AudioObjectPropertyAddress nameAddr = {
+            .mSelector = kAudioObjectPropertyName,
+            .mScope = kAudioObjectPropertyScopeGlobal,
+            .mElement = kAudioObjectPropertyElementMain
+        };
+        NSString *name = @"Audio Device";
+        if (AudioObjectGetPropertyData(devID, &nameAddr, 0, NULL, &propSize, &nameRef) == noErr && nameRef) {
+            name = (__bridge_transfer NSString *)nameRef;
+        }
+        
+        // Manufacturer
+        CFStringRef mfrRef = NULL;
+        propSize = sizeof(CFStringRef);
+        AudioObjectPropertyAddress mfrAddr = {
+            .mSelector = kAudioObjectPropertyManufacturer,
+            .mScope = kAudioObjectPropertyScopeGlobal,
+            .mElement = kAudioObjectPropertyElementMain
+        };
+        NSString *mfr = @"Apple Inc.";
+        if (AudioObjectGetPropertyData(devID, &mfrAddr, 0, NULL, &propSize, &mfrRef) == noErr && mfrRef) {
+            mfr = (__bridge_transfer NSString *)mfrRef;
+        }
+        
+        // UID
+        CFStringRef uidRef = NULL;
+        propSize = sizeof(CFStringRef);
+        AudioObjectPropertyAddress uidAddr = {
+            .mSelector = kAudioDevicePropertyDeviceUID,
+            .mScope = kAudioObjectPropertyScopeGlobal,
+            .mElement = kAudioObjectPropertyElementMain
+        };
+        NSString *uid = @"";
+        if (AudioObjectGetPropertyData(devID, &uidAddr, 0, NULL, &propSize, &uidRef) == noErr && uidRef) {
+            uid = (__bridge_transfer NSString *)uidRef;
+        }
+        
+        // Channels & Input / Output determination
+        AudioObjectPropertyAddress inputStreamsAddr = {
+            .mSelector = kAudioDevicePropertyStreams,
+            .mScope = kAudioDevicePropertyScopeInput,
+            .mElement = kAudioObjectPropertyElementMain
+        };
+        UInt32 inStreamSize = 0;
+        AudioObjectGetPropertyDataSize(devID, &inputStreamsAddr, 0, NULL, &inStreamSize);
+        BOOL isInput = (inStreamSize > 0);
+        
+        AudioObjectPropertyAddress outputStreamsAddr = {
+            .mSelector = kAudioDevicePropertyStreams,
+            .mScope = kAudioDevicePropertyScopeOutput,
+            .mElement = kAudioObjectPropertyElementMain
+        };
+        UInt32 outStreamSize = 0;
+        AudioObjectGetPropertyDataSize(devID, &outputStreamsAddr, 0, NULL, &outStreamSize);
+        BOOL isOutput = (outStreamSize > 0);
+        
+        // Sample rate
+        Float64 sampleRate = 0.0;
+        propSize = sizeof(Float64);
+        AudioObjectPropertyAddress rateAddr = {
+            .mSelector = kAudioDevicePropertyNominalSampleRate,
+            .mScope = kAudioObjectPropertyScopeGlobal,
+            .mElement = kAudioObjectPropertyElementMain
+        };
+        AudioObjectGetPropertyData(devID, &rateAddr, 0, NULL, &propSize, &sampleRate);
+        
+        // Volume
+        Float32 volume = 0.0f;
+        AudioObjectPropertyScope volScope = isOutput ? kAudioDevicePropertyScopeOutput : kAudioDevicePropertyScopeInput;
+        AudioObjectPropertyAddress volAddr = {
+            .mSelector = kAudioDevicePropertyVolumeScalar,
+            .mScope = volScope,
+            .mElement = kAudioObjectPropertyElementMain
+        };
+        propSize = sizeof(Float32);
+        if (AudioObjectHasProperty(devID, &volAddr)) {
+            AudioObjectGetPropertyData(devID, &volAddr, 0, NULL, &propSize, &volume);
+        }
+        
+        // Mute status
+        UInt32 mute = 0;
+        AudioObjectPropertyAddress muteAddr = {
+            .mSelector = kAudioDevicePropertyMute,
+            .mScope = volScope,
+            .mElement = kAudioObjectPropertyElementMain
+        };
+        propSize = sizeof(UInt32);
+        if (AudioObjectHasProperty(devID, &muteAddr)) {
+            AudioObjectGetPropertyData(devID, &muteAddr, 0, NULL, &propSize, &mute);
+        }
+        
+        MMAudioDevice *device = [[MMAudioDevice alloc] init];
+        device.deviceID = devID;
+        device.name = name;
+        device.manufacturer = mfr;
+        device.uid = uid;
+        device.isInput = isInput;
+        device.isOutput = isOutput;
+        device.isDefaultInput = (devID == defaultIn);
+        device.isDefaultOutput = (devID == defaultOut);
+        device.sampleRate = (double)sampleRate;
+        device.channelCount = (inStreamSize / sizeof(AudioStreamID)) + (outStreamSize / sizeof(AudioStreamID));
+        device.volume = volume;
+        device.isMuted = (mute != 0);
+        
+        [devices addObject:device];
+    }
+    
+    free(deviceIDs);
+    return devices;
+}
+
+- (nullable NSDictionary<NSString *, id> *)sampleTelemetryWithError:(NSError **)error {
+    NSArray<MMAudioDevice *> *devices = [MMAudioTelemetryProvider sampleAudioDevices];
+    NSMutableArray<NSDictionary<NSString *, id> *> *deviceList = [NSMutableArray arrayWithCapacity:devices.count];
+    
+    MMAudioDevice *defaultIn = nil;
+    MMAudioDevice *defaultOut = nil;
+    
+    for (MMAudioDevice *d in devices) {
+        [deviceList addObject:[d toDictionary]];
+        if (d.isDefaultInput) defaultIn = d;
+        if (d.isDefaultOutput) defaultOut = d;
+    }
+    
+    return @{
+        @"devices": deviceList,
+        @"deviceCount": @(devices.count),
+        @"defaultInputDevice": defaultIn ? [defaultIn toDictionary] : [NSNull null],
+        @"defaultOutputDevice": defaultOut ? [defaultOut toDictionary] : [NSNull null]
+    };
+}
+
+@end

Sources/Telemetry/Display/MMDisplayManager.h

@@ -0,0 +1,42 @@
+#import <Foundation/Foundation.h>
+#import <CoreGraphics/CoreGraphics.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MMDisplayInfo : NSObject
+
+@property (nonatomic, readonly) CGDirectDisplayID displayID;
+@property (nonatomic, readonly, copy) NSString *name;
+@property (nonatomic, readonly) BOOL isBuiltin;
+@property (nonatomic, readonly) BOOL isMain;
+@property (nonatomic, readonly) BOOL isOnline;
+@property (nonatomic, readonly) uint32_t width;
+@property (nonatomic, readonly) uint32_t height;
+@property (nonatomic, readonly) double refreshRate;
+@property (nonatomic, readonly) float brightness; // 0.0 to 1.0, or -1.0 if not supported
+
+- (instancetype)initWithDisplayID:(CGDirectDisplayID)displayID
+                             name:(NSString *)name
+                        isBuiltin:(BOOL)isBuiltin
+                           isMain:(BOOL)isMain
+                         isOnline:(BOOL)isOnline
+                            width:(uint32_t)width
+                           height:(uint32_t)height
+                      refreshRate:(double)refreshRate
+                       brightness:(float)brightness NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+@end
+
+@interface MMDisplayManager : NSObject
+
++ (instancetype)sharedManager;
+
+- (NSArray<MMDisplayInfo *> *)activeDisplays;
+- (float)brightnessForDisplay:(CGDirectDisplayID)displayID;
+- (BOOL)setBrightness:(float)brightness forDisplay:(CGDirectDisplayID)displayID;
+
+@end
+
+NS_ASSUME_NONNULL_END

Sources/Telemetry/Display/MMDisplayManager.m

@@ -0,0 +1,168 @@
+#import "MMDisplayManager.h"
+#import <IOKit/graphics/IOGraphicsLib.h>
+#import <dlfcn.h>
+
+// Private DisplayServices API signatures
+typedef int (*DisplayServicesGetBrightnessFunc)(CGDirectDisplayID display, float *brightness);
+typedef int (*DisplayServicesSetBrightnessFunc)(CGDirectDisplayID display, float brightness);
+
+@implementation MMDisplayInfo
+
+- (instancetype)initWithDisplayID:(CGDirectDisplayID)displayID
+                             name:(NSString *)name
+                        isBuiltin:(BOOL)isBuiltin
+                           isMain:(BOOL)isMain
+                         isOnline:(BOOL)isOnline
+                            width:(uint32_t)width
+                           height:(uint32_t)height
+                      refreshRate:(double)refreshRate
+                       brightness:(float)brightness {
+    self = [super init];
+    if (self) {
+        _displayID = displayID;
+        _name = [name copy] ?: @"Unknown Display";
+        _isBuiltin = isBuiltin;
+        _isMain = isMain;
+        _isOnline = isOnline;
+        _width = width;
+        _height = height;
+        _refreshRate = refreshRate;
+        _brightness = brightness;
+    }
+    return self;
+}
+
+@end
+
+@implementation MMDisplayManager {
+    void *_displayServicesHandle;
+    DisplayServicesGetBrightnessFunc _getBrightnessFunc;
+    DisplayServicesSetBrightnessFunc _setBrightnessFunc;
+}
+
++ (instancetype)sharedManager {
+    static MMDisplayManager *sharedInstance = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        sharedInstance = [[self alloc] init];
+    });
+    return sharedInstance;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        [self loadDisplayServices];
+    }
+    return self;
+}
+
+- (void)dealloc {
+    if (_displayServicesHandle) {
+        dlclose(_displayServicesHandle);
+        _displayServicesHandle = NULL;
+    }
+}
+
+- (void)loadDisplayServices {
+    _displayServicesHandle = dlopen("/System/Library/PrivateFrameworks/DisplayServices.framework/DisplayServices", RTLD_LAZY);
+    if (_displayServicesHandle) {
+        _getBrightnessFunc = (DisplayServicesGetBrightnessFunc)dlsym(_displayServicesHandle, "DisplayServicesGetBrightness");
+        _setBrightnessFunc = (DisplayServicesSetBrightnessFunc)dlsym(_displayServicesHandle, "DisplayServicesSetBrightness");
+    }
+}
+
+- (NSArray<MMDisplayInfo *> *)activeDisplays {
+    uint32_t maxDisplays = 16;
+    CGDirectDisplayID onlineDisplays[16];
+    uint32_t displayCount = 0;
+    
+    CGError err = CGGetOnlineDisplayList(maxDisplays, onlineDisplays, &displayCount);
+    if (err != kCGErrorSuccess || displayCount == 0) {
+        return @[];
+    }
+    
+    NSMutableArray<MMDisplayInfo *> *result = [NSMutableArray arrayWithCapacity:displayCount];
+    CGDirectDisplayID mainDisplay = CGMainDisplayID();
+    
+    for (uint32_t i = 0; i < displayCount; i++) {
+        CGDirectDisplayID dID = onlineDisplays[i];
+        BOOL isBuiltin = CGDisplayIsBuiltin(dID);
+        BOOL isMain = (dID == mainDisplay);
+        BOOL isOnline = CGDisplayIsOnline(dID);
+        
+        uint32_t width = (uint32_t)CGDisplayPixelsWide(dID);
+        uint32_t height = (uint32_t)CGDisplayPixelsHigh(dID);
+        
+        CGDisplayModeRef mode = CGDisplayCopyDisplayMode(dID);
+        double refreshRate = 0.0;
+        if (mode) {
+            refreshRate = CGDisplayModeGetRefreshRate(mode);
+            CGDisplayModeRelease(mode);
+        }
+        
+        NSString *displayName = isBuiltin ? @"Built-in Retina Display" : [NSString stringWithFormat:@"External Display (%u)", (unsigned int)dID];
+        float brightness = [self brightnessForDisplay:dID];
+        
+        MMDisplayInfo *info = [[MMDisplayInfo alloc] initWithDisplayID:dID
+                                                                  name:displayName
+                                                             isBuiltin:isBuiltin
+                                                                isMain:isMain
+                                                              isOnline:isOnline
+                                                                 width:width
+                                                                height:height
+                                                           refreshRate:refreshRate
+                                                            brightness:brightness];
+        [result addObject:info];
+    }
+    
+    return [result copy];
+}
+
+- (float)brightnessForDisplay:(CGDirectDisplayID)displayID {
+    if (_getBrightnessFunc) {
+        float b = 0.0f;
+        int status = _getBrightnessFunc(displayID, &b);
+        if (status == 0) {
+            return b;
+        }
+    }
+    
+    // Fallback using IOKit
+    io_service_t service = CGDisplayIOServicePort(displayID);
+    if (service != MACH_PORT_NULL) {
+        float brightness = 0.0f;
+        CFStringRef key = CFSTR(kIODisplayBrightnessKey);
+        kern_return_t kr = IODisplayGetFloatParameter(service, kNilOptions, key, &brightness);
+        if (kr == kIOReturnSuccess) {
+            return brightness;
+        }
+    }
+    
+    return -1.0f;
+}
+
+- (BOOL)setBrightness:(float)brightness forDisplay:(CGDirectDisplayID)displayID {
+    if (brightness < 0.0f) brightness = 0.0f;
+    if (brightness > 1.0f) brightness = 1.0f;
+    
+    if (_setBrightnessFunc) {
+        int status = _setBrightnessFunc(displayID, brightness);
+        if (status == 0) {
+            return YES;
+        }
+    }
+    
+    io_service_t service = CGDisplayIOServicePort(displayID);
+    if (service != MACH_PORT_NULL) {
+        CFStringRef key = CFSTR(kIODisplayBrightnessKey);
+        kern_return_t kr = IODisplaySetFloatParameter(service, kNilOptions, key, brightness);
+        if (kr == kIOReturnSuccess) {
+            return YES;
+        }
+    }
+    
+    return NO;
+}
+
+@end

Tests/MMAudioTests.swift

@@ -0,0 +1,80 @@
+//
+//  MMAudioTests.swift
+//  MacMonitorTests
+//
+//  Unit and integration tests for MMAudioTelemetryProvider.
+//
+
+import XCTest
+@testable import MacMonitor
+
+final class MMAudioTests: XCTestCase {
+    var provider: MMAudioTelemetryProvider!
+
+    override func setUp() {
+        super.setUp()
+        provider = MMAudioTelemetryProvider()
+    }
+
+    override func tearDown() {
+        provider = nil
+        super.tearDown()
+    }
+
+    func testDomainAndIdentifier() {
+        XCTAssertEqual(provider.domain, .audio)
+        XCTAssertEqual(provider.providerIdentifier, "com.i3omb.macmonitor.telemetry.audio")
+        XCTAssertTrue(provider.isAvailable)
+    }
+
+    func testSampleAudioDevicesLive() {
+        do {
+            let sample = try provider.sampleTelemetry()
+            XCTAssertNotNil(sample)
+            
+            let count = sample["deviceCount"] as? Int ?? 0
+            XCTAssertGreaterThanOrEqual(count, 0)
+            
+            let devices = sample["devices"] as? [[String: Any]] ?? []
+            XCTAssertEqual(devices.count, count)
+            
+            if count > 0 {
+                for dev in devices {
+                    XCTAssertNotNil(dev["name"])
+                    XCTAssertNotNil(dev["deviceID"])
+                    XCTAssertNotNil(dev["isInput"])
+                    XCTAssertNotNil(dev["isOutput"])
+                }
+            }
+        } catch {
+            XCTFail("sampleTelemetry threw error: \(error)")
+        }
+    }
+
+    func testAudioDeviceModel() {
+        let dev = MMAudioDevice()
+        dev.deviceID = 42
+        dev.name = "External USB DAC"
+        dev.manufacturer = "FiiO"
+        dev.uid = "USB:1234"
+        dev.isInput = false
+        dev.isOutput = true
+        dev.isDefaultOutput = true
+        dev.isDefaultInput = false
+        dev.sampleRate = 96000.0
+        dev.channelCount = 2
+        dev.volume = 0.75
+        dev.isMuted = false
+
+        let dict = dev.toDictionary()
+        XCTAssertEqual(dict["deviceID"] as? UInt32, 42)
+        XCTAssertEqual(dict["name"] as? String, "External USB DAC")
+        XCTAssertEqual(dict["manufacturer"] as? String, "FiiO")
+        XCTAssertEqual(dict["isOutput"] as? Bool, true)
+        XCTAssertEqual(dict["isDefaultOutput"] as? Bool, true)
+        XCTAssertEqual(dict["sampleRate"] as? Double, 96000.0)
+        XCTAssertEqual(dict["channelCount"] as? UInt32, 2)
+        XCTAssertEqual(dict["volume"] as? Float, 0.75)
+        XCTAssertEqual(dict["isMuted"] as? Bool, false)
+    }
+}

Tests/MMDisplayTests.swift

@@ -0,0 +1,46 @@
+import XCTest
+@testable import MacMonitor
+
+final class MMDisplayTests: XCTestCase {
+    
+    func testDisplayManagerActiveDisplays() {
+        let manager = MMDisplayManager.shared()
+        XCTAssertNotNil(manager, "MMDisplayManager instance should not be nil")
+        
+        let displays = manager.activeDisplays()
+        XCTAssertNotNil(displays, "Active displays array should not be nil")
+        // In CI or headless/headless VM or real Mac, online display list can be checked
+        for display in displays {
+            XCTAssertGreaterThan(display.displayID, 0)
+            XCTAssertFalse(display.name.isEmpty)
+            if display.isOnline {
+                XCTAssertGreaterThan(display.width, 0)
+                XCTAssertGreaterThan(display.height, 0)
+            }
+        }
+    }
+    
+    func testDisplayInfoInitialization() {
+        let info = MMDisplayInfo(
+            displayID: 1001,
+            name: "Test Display",
+            isBuiltin: true,
+            isMain: true,
+            isOnline: true,
+            width: 2560,
+            height: 1600,
+            refreshRate: 60.0,
+            brightness: 0.75
+        )
+        
+        XCTAssertEqual(info.displayID, 1001)
+        XCTAssertEqual(info.name, "Test Display")
+        XCTAssertTrue(info.isBuiltin)
+        XCTAssertTrue(info.isMain)
+        XCTAssertTrue(info.isOnline)
+        XCTAssertEqual(info.width, 2560)
+        XCTAssertEqual(info.height, 1600)
+        XCTAssertEqual(info.refreshRate, 60.0)
+        XCTAssertEqual(info.brightness, 0.75, accuracy: 0.001)
+    }
+}

Tests/MacMonitorTests.swift

@@ -28,7 +28,7 @@ final class MacMonitorCoreTests: XCTestCase {
     func testSystemTelemetryStoreInitialStateAndProviders() {
         let store = SystemTelemetryStore.shared
         XCTAssertNotNil(store)
-        XCTAssertEqual(store.registeredProviderCount, 7)
+        XCTAssertEqual(store.registeredProviderCount, 17)
         XCTAssertFalse(store.hostModel.isEmpty)
         XCTAssertFalse(store.kernelVersion.isEmpty)
         XCTAssertGreaterThanOrEqual(store.physicalCpuCount, 1)