feat: initial project scaffold

- Android Auto CarAppService, Session, Screen
- Voice pipeline: STT (SpeechManager), TTS (TTSManager), VoiceStateMachine
- Matrix REST client (login, send, sync) - no E2EE, raw API
- FCM push receiver with response dedup
- Network monitor + offline message queue
- Phone setup activity stub
- Full architecture spec in docs/ARCHITECTURE.md

app/src/main/java/farm/hobbs/clippyauto/ui/SetupActivity.kt

@@ -0,0 +1,30 @@
+package farm.hobbs.clippyauto.ui
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import farm.hobbs.clippyauto.R
+
+/**
+ * Phone-side activity for initial setup and session monitoring.
+ *
+ * v1 MVP:
+ * - Login to Matrix homeserver (first run)
+ * - Show "session active" indicator during Android Auto use
+ * - Display debrief summary notification after session ends
+ *
+ * v2:
+ * - Full conversation transcript review
+ * - Settings (silence thresholds, TTS voice, etc.)
+ */
+class SetupActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        // TODO: Build setup UI
+        // - Matrix homeserver URL (pre-filled: mess.hobbs.farm)
+        // - Username / password fields
+        // - Login button
+        // - Status: connected / disconnected
+        // - "Session active" indicator
+    }
+}