Initial commit

Whisper model weights excluded from git — auto-downloaded at first Xcode
build via Scripts/download_whisper_model.sh (~600 MB, one-time).

LockInBroMonitor/DeviceActivityMonitorExtension.swift

@@ -0,0 +1,61 @@
+//
+//  DeviceActivityMonitorExtension.swift
+//  LockInBroMonitor
+//
+//  When a distraction-app usage event exceeds the user's threshold,
+//  this extension applies a ManagedSettings shield so the app shows
+//  a "get back to work" overlay. Shields are cleared when the focus
+//  session schedule ends or the main app calls stopMonitoring().
+//
+
+import DeviceActivity
+import FamilyControls
+import Foundation
+import ManagedSettings
+
+class DeviceActivityMonitorExtension: DeviceActivityMonitor {
+
+    private let store = ManagedSettingsStore(named: .lockinbro)
+    private let defaults = UserDefaults(suiteName: "group.com.adipu.LockInBroMobile")
+
+    // MARK: - Threshold Reached
+
+    override func eventDidReachThreshold(_ event: DeviceActivityEvent.Name, activity: DeviceActivityName) {
+        super.eventDidReachThreshold(event, activity: activity)
+
+        // Load the user's selected distraction apps from the shared App Group
+        guard let data = defaults?.data(forKey: "screenTimeSelection"),
+              let selection = try? JSONDecoder().decode(FamilyActivitySelection.self, from: data) else {
+            return
+        }
+
+        // Apply shield to all selected apps — once ANY threshold fires, shield them all.
+        // This is simpler and gives the user a single nudge rather than per-app shields
+        // trickling in one-by-one.
+        store.shield.applications = selection.applicationTokens.isEmpty ? nil : selection.applicationTokens
+        store.shield.applicationCategories = selection.categoryTokens.isEmpty
+            ? nil
+            : ShieldSettings.ActivityCategoryPolicy.specific(selection.categoryTokens)
+    }
+
+    // MARK: - Schedule Lifecycle
+
+    override func intervalDidStart(for activity: DeviceActivityName) {
+        super.intervalDidStart(for: activity)
+        // Ensure shields are clear at the start of each monitoring interval
+        store.shield.applications = nil
+        store.shield.applicationCategories = nil
+    }
+
+    override func intervalDidEnd(for activity: DeviceActivityName) {
+        super.intervalDidEnd(for: activity)
+        // Clean up shields when the schedule interval ends
+        store.shield.applications = nil
+        store.shield.applicationCategories = nil
+    }
+}
+
+// Mirror the named store constant from the main app
+extension ManagedSettingsStore.Name {
+    static let lockinbro = ManagedSettingsStore.Name("lockinbro")
+}