feat: merge T-2.6 SessionSwitcher + T-2.8 StatusBar + T-2.11 Face-ID

- SessionRegistry + SessionSwitcher + SessionRow (T-2.6)
- StatusBar component with pi-state indicator (T-2.8)
- FaceIDGate + SettingsView + LockView (T-2.11)
- Reconciled MainTerminalView: StatusBar wired with onSwitcher/onSettings/onUnpair,
  two .task modifiers, two .sheet modifiers (SessionSwitcher + SettingsView)
- AppState: appDidBackground/appWillForeground + isLocked (T-2.11)
- ContentView: scenePhase tracking + LockView overlay (T-2.11)
- Pairing.swift: fp param is optional pre-TLS (dev convenience)

Sources/App/AppState.swift

@@ -7,6 +7,8 @@ final class AppState: ObservableObject {
     static let shared = AppState()
 
     @Published var credential: SidecarCredential? = nil
+    @Published var isLocked = false
+    @Published var lastForegroundedAt: Date = Date()
 
     private init() {
         // Try loading persisted credential on launch
@@ -22,4 +24,18 @@ final class AppState: ObservableObject {
         credential = nil
         Keychain.shared.delete(key: "piremote.credential")
     }
+
+    // MARK: - Face ID gate
+
+    func appDidBackground() {
+        lastForegroundedAt = Date()
+    }
+
+    func appWillForeground() async {
+        let elapsed = Date().timeIntervalSince(lastForegroundedAt)
+        guard elapsed > 60 else { return }  // within 60s → no re-auth
+        isLocked = true
+        let ok = await FaceIDGate.authenticate()
+        isLocked = !ok
+    }
 }

Sources/App/ContentView.swift

@@ -4,8 +4,10 @@ import SwiftUI
 
 struct ContentView: View {
     @EnvironmentObject var appState: AppState
+    @Environment(\.scenePhase) private var scenePhase
 
     var body: some View {
+        ZStack {
             Group {
                 if let credential = appState.credential {
                     MainTerminalView(credential: credential)
@@ -15,5 +17,18 @@ struct ContentView: View {
                     }
                 }
             }
+            .onChange(of: scenePhase) { _, new in
+                if new == .background {
+                    appState.appDidBackground()
+                } else if new == .active {
+                    Task { await appState.appWillForeground() }
+                }
+            }
+
+            if appState.isLocked {
+                LockView()
+            }
+        }
+        .task { await appState.appWillForeground() }
     }
 }

Sources/Core/Auth/FaceIDGate.swift

@@ -0,0 +1,24 @@
+// Sources/Core/Auth/FaceIDGate.swift
+// T-2.11: Biometric gate — evaluates Face ID if enabled in settings.
+
+import Foundation
+import LocalAuthentication
+
+/// Evaluates biometrics if Face ID is enabled in settings.
+/// Returns true if auth succeeded or Face ID is disabled.
+struct FaceIDGate: Sendable {
+    @MainActor
+    static func authenticate(reason: String = "Unlock pi remote") async -> Bool {
+        guard UserDefaults.standard.bool(forKey: "faceid.enabled") else { return true }
+        let context = LAContext()
+        var error: NSError?
+        guard context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error) else {
+            return true  // no biometrics available → allow
+        }
+        do {
+            return try await context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: reason)
+        } catch {
+            return false
+        }
+    }
+}

Sources/Core/Auth/Pairing.swift

@@ -71,7 +71,8 @@ struct PairingService: Sendable {
         }
 
         let pairingToken  = try queryValue("pair")
-        let fingerprint   = try queryValue("fp")
+        // fp may be empty pre-TLS (Phase 1); allowed for dev
+        let fingerprint   = items.first(where: { $0.name == "fp" })?.value ?? ""
         let name          = try queryValue("name")
 
         return (host: host, port: port, pairingToken: pairingToken,

Sources/Core/Sessions/SessionRegistry.swift

@@ -0,0 +1,120 @@
+// Sources/Core/Sessions/SessionRegistry.swift
+// T-2.6: Session listing, creation, and deletion via the sidecar REST API.
+
+import Foundation
+
+// MARK: - SessionInfo
+
+public struct SessionInfo: Identifiable, Hashable, Sendable {
+    public let id: String
+    public let name: String
+    public let state: String  // "running", "idle", etc.
+}
+
+// MARK: - SessionRegistry
+
+@MainActor
+public final class SessionRegistry: ObservableObject {
+    @Published public var sessions: [SessionInfo] = []
+    @Published public var isLoading = false
+    @Published public var error: String? = nil
+
+    public init() {}
+
+    // MARK: - Private helpers
+
+    private func baseURL(credential: SidecarCredential) -> URL {
+        URL(string: "http://\(credential.host):\(credential.port)")!
+    }
+
+    private func authorizedRequest(url: URL, credential: SidecarCredential) -> URLRequest {
+        var req = URLRequest(url: url)
+        req.setValue("Bearer \(credential.bearerToken)", forHTTPHeaderField: "Authorization")
+        return req
+    }
+
+    // MARK: - GET /sessions
+
+    /// Fetches the current session list from the sidecar and updates `sessions`.
+    public func refresh(credential: SidecarCredential) async {
+        isLoading = true
+        error = nil
+        defer { isLoading = false }
+
+        let url = baseURL(credential: credential).appendingPathComponent("sessions")
+        let req = authorizedRequest(url: url, credential: credential)
+
+        do {
+            let (data, _) = try await URLSession.shared.data(for: req)
+            let items = try JSONDecoder().decode([SessionItem].self, from: data)
+            sessions = items.map { SessionInfo(id: $0.id, name: $0.name, state: $0.state) }
+        } catch {
+            self.error = error.localizedDescription
+        }
+    }
+
+    // MARK: - POST /sessions
+
+    /// Creates a new session with the given name and returns the created `SessionInfo`.
+    @discardableResult
+    public func spawnSession(name: String, credential: SidecarCredential) async throws -> SessionInfo {
+        let url = baseURL(credential: credential).appendingPathComponent("sessions")
+        var req = authorizedRequest(url: url, credential: credential)
+        req.httpMethod = "POST"
+        req.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        req.httpBody = try JSONEncoder().encode(["name": name])
+
+        let (data, response) = try await URLSession.shared.data(for: req)
+
+        guard let http = response as? HTTPURLResponse, (200..<300).contains(http.statusCode) else {
+            throw SessionRegistryError.unexpectedStatus
+        }
+
+        let item = try JSONDecoder().decode(SessionItem.self, from: data)
+        let info = SessionInfo(id: item.id, name: item.name, state: item.state)
+
+        // Append optimistically; a follow-up refresh will normalise order.
+        sessions.append(info)
+        return info
+    }
+
+    // MARK: - DELETE /sessions/<id>
+
+    /// Deletes the session with the given id.
+    public func deleteSession(id: String, credential: SidecarCredential) async throws {
+        let url = baseURL(credential: credential)
+            .appendingPathComponent("sessions")
+            .appendingPathComponent(id)
+        var req = authorizedRequest(url: url, credential: credential)
+        req.httpMethod = "DELETE"
+
+        let (_, response) = try await URLSession.shared.data(for: req)
+
+        guard let http = response as? HTTPURLResponse, (200..<300).contains(http.statusCode) else {
+            throw SessionRegistryError.unexpectedStatus
+        }
+
+        sessions.removeAll { $0.id == id }
+    }
+}
+
+// MARK: - Private Codable helper
+
+private struct SessionItem: Decodable {
+    let id: String
+    let name: String
+    let state: String
+}
+
+// MARK: - Errors
+
+public enum SessionRegistryError: LocalizedError {
+    case unexpectedStatus
+
+    public var errorDescription: String? {
+        switch self {
+        case .unexpectedStatus:
+            return "Unexpected HTTP status from sidecar."
+        }
+    }
+}

Sources/UI/Sessions/SessionRow.swift

@@ -0,0 +1,40 @@
+// Sources/UI/Sessions/SessionRow.swift
+// T-2.6: Row view for a single session in the SessionSwitcher list.
+
+import SwiftUI
+
+struct SessionRow: View {
+    let session: SessionInfo
+
+    var body: some View {
+        HStack {
+            Text(session.name)
+                .font(.body)
+            Spacer()
+            stateBadge
+        }
+    }
+
+    @ViewBuilder
+    private var stateBadge: some View {
+        HStack(spacing: 4) {
+            Circle()
+                .fill(badgeColor)
+                .frame(width: 8, height: 8)
+            Text(session.state)
+                .font(.caption)
+                .foregroundStyle(badgeColor)
+        }
+    }
+
+    private var badgeColor: Color {
+        switch session.state.lowercased() {
+        case "running", "active":
+            return .green
+        case "idle":
+            return .yellow
+        default:
+            return .secondary
+        }
+    }
+}

Sources/UI/Sessions/SessionSwitcher.swift

@@ -0,0 +1,92 @@
+// Sources/UI/Sessions/SessionSwitcher.swift
+// T-2.6: Sheet UI for listing, selecting, and creating sessions.
+
+import SwiftUI
+
+struct SessionSwitcher: View {
+    @ObservedObject var registry: SessionRegistry
+    let credential: SidecarCredential
+    let onSelect: (SessionInfo) -> Void
+
+    @Environment(\.dismiss) private var dismiss
+
+    @State private var showNewSessionAlert = false
+    @State private var newSessionName = ""
+    @State private var spawnError: String? = nil
+
+    var body: some View {
+        NavigationStack {
+            Group {
+                if registry.isLoading {
+                    ProgressView("Loading sessions…")
+                        .frame(maxWidth: .infinity, maxHeight: .infinity)
+                } else {
+                    List(registry.sessions) { session in
+                        Button {
+                            onSelect(session)
+                            dismiss()
+                        } label: {
+                            SessionRow(session: session)
+                        }
+                        .foregroundStyle(.primary)
+                    }
+                    .overlay {
+                        if registry.sessions.isEmpty {
+                            ContentUnavailableView(
+                                "No Sessions",
+                                systemImage: "terminal",
+                                description: Text("Tap + to create a session.")
+                            )
+                        }
+                    }
+                }
+            }
+            .navigationTitle("Sessions")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Done") { dismiss() }
+                }
+                ToolbarItem(placement: .primaryAction) {
+                    Button {
+                        newSessionName = ""
+                        spawnError = nil
+                        showNewSessionAlert = true
+                    } label: {
+                        Image(systemName: "plus")
+                    }
+                }
+            }
+            .alert("New Session", isPresented: $showNewSessionAlert) {
+                TextField("Session name", text: $newSessionName)
+                    .autocorrectionDisabled()
+                Button("Create") {
+                    let name = newSessionName.trimmingCharacters(in: .whitespaces)
+                    guard !name.isEmpty else { return }
+                    Task {
+                        do {
+                            try await registry.spawnSession(name: name, credential: credential)
+                            await registry.refresh(credential: credential)
+                        } catch {
+                            spawnError = error.localizedDescription
+                        }
+                    }
+                }
+                Button("Cancel", role: .cancel) {}
+            } message: {
+                Text("Enter a name for the new session.")
+            }
+            .safeAreaInset(edge: .bottom) {
+                if let err = registry.error ?? spawnError {
+                    Text(err)
+                        .font(.caption)
+                        .foregroundStyle(.red)
+                        .padding(8)
+                        .frame(maxWidth: .infinity, alignment: .leading)
+                        .background(Color(uiColor: .secondarySystemBackground))
+                }
+            }
+        }
+        .task { await registry.refresh(credential: credential) }
+    }
+}

Sources/UI/Settings/LockView.swift

@@ -0,0 +1,16 @@
+// Sources/UI/Settings/LockView.swift
+// T-2.11: Full-screen lock overlay shown when isLocked == true.
+
+import SwiftUI
+
+struct LockView: View {
+    var body: some View {
+        ZStack {
+            Rectangle().fill(.ultraThinMaterial).ignoresSafeArea()
+            VStack(spacing: 16) {
+                Image(systemName: "lock.fill").font(.system(size: 48))
+                Text("Locked").font(.title2)
+            }
+        }
+    }
+}

Sources/UI/Settings/SettingsView.swift

@@ -0,0 +1,48 @@
+// Sources/UI/Settings/SettingsView.swift
+// T-2.11: Settings sheet — Face ID toggle + credential info + unpair.
+
+import LocalAuthentication
+import SwiftUI
+
+@MainActor
+struct SettingsView: View {
+    let credential: SidecarCredential
+    @EnvironmentObject var appState: AppState
+    @Environment(\.dismiss) var dismiss
+
+    @AppStorage("faceid.enabled") private var faceIDEnabled = false
+
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section("Security") {
+                    Toggle("Require Face ID", isOn: $faceIDEnabled)
+                    if faceIDEnabled {
+                        Text("Face ID is required on launch and after 60 seconds in background.")
+                            .font(.caption)
+                            .foregroundStyle(.secondary)
+                    }
+                }
+
+                Section("Sidecar") {
+                    LabeledContent("Name", value: credential.sidecarName)
+                    LabeledContent("Host", value: "\(credential.host):\(credential.port)")
+                    LabeledContent("Paired", value: credential.pairedAt.formatted(date: .abbreviated, time: .shortened))
+                }
+
+                Section("Danger") {
+                    Button("Unpair", role: .destructive) {
+                        appState.unpair()
+                        dismiss()
+                    }
+                }
+            }
+            .navigationTitle("Settings")
+            .toolbar {
+                ToolbarItem(placement: .topBarTrailing) {
+                    Button("Done") { dismiss() }
+                }
+            }
+        }
+    }
+}

Sources/UI/Status/StatusBar.swift

@@ -0,0 +1,99 @@
+// StatusBar.swift
+// T-2.8 — Session status bar with pi-state indicator and action buttons.
+
+import Combine
+import SwiftUI
+
+@MainActor
+struct StatusBar: View {
+    let sessionName: String
+    let connectionStatus: String  // "Connecting…", "Connected", "Disconnected"
+    @Binding var piState: PiState?
+    var onSwitcher: (() -> Void)? = nil
+    var onUnpair: (() -> Void)? = nil
+    var onSettings: (() -> Void)? = nil
+
+    var body: some View {
+        VStack(spacing: 0) {
+            HStack {
+                // ── Left: session name ──────────────────────────────
+                Text(sessionName.isEmpty ? " " : sessionName)
+                    .font(.caption.monospaced())
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
+                    .truncationMode(.middle)
+
+                Spacer()
+
+                // ── Center: pi state / connection status ────────────
+                stateIndicator
+
+                Spacer()
+
+                // ── Right: icon buttons ─────────────────────────────
+                HStack(spacing: 14) {
+                    if onSwitcher != nil {
+                        Button {
+                            onSwitcher?()
+                        } label: {
+                            Image(systemName: "list.bullet")
+                                .font(.caption)
+                        }
+                    }
+
+                    if onSettings != nil {
+                        Button {
+                            onSettings?()
+                        } label: {
+                            Image(systemName: "gear")
+                                .font(.caption)
+                        }
+                    }
+
+                    if onUnpair != nil {
+                        Button {
+                            onUnpair?()
+                        } label: {
+                            Image(systemName: "x.circle")
+                                .font(.caption)
+                                .foregroundStyle(.red)
+                        }
+                    }
+                }
+            }
+            .padding(.horizontal, 12)
+            .padding(.vertical, 6)
+            .background(Color(uiColor: .systemBackground))
+
+            Divider()
+        }
+    }
+
+    // MARK: - State indicator
+
+    @ViewBuilder
+    private var stateIndicator: some View {
+        if let state = piState {
+            switch state {
+            case .thinking:
+                Text("● thinking")
+                    .font(.caption.monospaced())
+                    .foregroundStyle(.orange)
+            case .tool:
+                Text("▶ tool")
+                    .font(.caption.monospaced())
+                    .foregroundStyle(.blue)
+            case .awaitingInput:
+                Text("⏸ awaiting")
+                    .font(.caption.monospaced())
+                    .foregroundStyle(.yellow)
+            case .idle:
+                EmptyView()
+            }
+        } else {
+            Text(connectionStatus)
+                .font(.caption.monospaced())
+                .foregroundStyle(.secondary)
+        }
+    }
+}

Sources/UI/Terminal/MainTerminalView.swift

@@ -12,28 +12,26 @@ struct MainTerminalView: View {
     @State private var terminalVC = TerminalViewController()
     @State private var connection: SessionConnection? = nil
     @State private var statusText = "Connecting…"
+    @State private var currentPiState: PiState? = nil
+    @State private var sessionName = ""
+    @State private var showSwitcher = false
+    @State private var showSettings = false                   // T-2.11
+    @State private var activeSessionId: String? = nil        // T-2.6
     @State private var cancellables = Set<AnyCancellable>()
+    @StateObject private var registry = SessionRegistry()    // T-2.6
     @EnvironmentObject var appState: AppState
 
     var body: some View {
         VStack(spacing: 0) {
             // ── Status bar ──────────────────────────────────────────
-            HStack {
-                Text(statusText)
-                    .font(.caption.monospaced())
-                    .foregroundStyle(.secondary)
-                Spacer()
-                Button("Unpair") {
-                    appState.unpair()
-                }
-                .font(.caption)
-                .foregroundStyle(.red)
-            }
-            .padding(.horizontal, 12)
-            .padding(.vertical, 6)
-            .background(Color(uiColor: .systemBackground))
-
-            Divider()
+            StatusBar(
+                sessionName: sessionName,
+                connectionStatus: statusText,
+                piState: $currentPiState,
+                onSwitcher: { showSwitcher = true },
+                onSettings: { showSettings = true },          // T-2.11
+                onUnpair: { appState.unpair() }
+            )
 
             // ── Terminal ────────────────────────────────────────────
             TerminalViewRepresentable(controller: terminalVC)
@@ -51,6 +49,16 @@ struct MainTerminalView: View {
             .background(Color(uiColor: .secondarySystemBackground))
         }
         .task { await bootstrap() }
+        .task { await registry.refresh(credential: credential) }    // T-2.6
+        .sheet(isPresented: $showSwitcher) {                        // T-2.6
+            SessionSwitcher(registry: registry, credential: credential) { session in
+                activeSessionId = session.id
+            }
+        }
+        .sheet(isPresented: $showSettings) {                        // T-2.11
+            SettingsView(credential: credential)
+                .environmentObject(appState)
+        }
     }
 
     // MARK: - Bootstrap
@@ -113,7 +121,7 @@ struct MainTerminalView: View {
                 .first()
                 .receive(on: DispatchQueue.main)
                 .sink { [weak conn, terminalVC] _ in
-                    // Clear immediately — don’t show stale/mismatched content.
+                    // Clear immediately — don't show stale/mismatched content.
                     terminalVC.feed(data: Data("\u{1B}[H\u{1B}[2J".utf8))
 
                     Task { @MainActor in
@@ -129,6 +137,24 @@ struct MainTerminalView: View {
                 }
                 .store(in: &cancellables)
 
+            // Wire stateEvents → currentPiState
+            conn.stateEvents
+                .compactMap { event -> PiState? in
+                    if case .state(let s, _, _) = event { return s } else { return nil }
+                }
+                .receive(on: DispatchQueue.main)
+                .sink { state in currentPiState = state }
+                .store(in: &cancellables)
+
+            // Wire stateEvents → sessionName
+            conn.stateEvents
+                .compactMap { event -> String? in
+                    if case .sessionMeta(let name, _, _) = event { return name } else { return nil }
+                }
+                .receive(on: DispatchQueue.main)
+                .sink { name in sessionName = name }
+                .store(in: &cancellables)
+
             connection = conn
 
             let lastSeq: UInt64? = conn.scrollback.sizeBytes > 0