Add OVERWATCH v0.1.0 — full detection engine + polish

Phase 1 (BLE), Phase 2 (WiFi BSSID/SSID), Phase 3 (DeFlock map proximity),
Phase 4 (Waze live POLICE alerts), and Phase 5 polish all wired through one
DetectionStore. Confidence engine scores 0-100; UI maps to 4-tier circle.

Polish:
  - Stylized two-line app title: [DЯΣΛMMΛKΣЯ] // 0VΣЯW4TCH
  - Modal bottom sheet for source drill-down (tap circle)
  - Settings screen: per-source toggles, proximity sliders, theme select
  - SharedPreferences-backed Settings with StateFlow exposure
  - DetectionService respects per-source toggles at start time
  - Scanners read proximity overrides via supplier lambdas

README documents all sources, architecture, build steps, permissions, and
the legal disclaimer.

.gitignore

@@ -15,3 +15,15 @@ __pycache__/
 *.pyc
 .idea/
 .vscode/
+
+# Android / Gradle
+.gradle/
+.kotlin/
+local.properties
+*.iml
+.cxx/
+captures/
+app/build/
+app/release/
+**/build/
+**/release/