feature(updater): Implement auto-updating system using AppCast protocol

README.md

@@ -41,10 +41,19 @@ Set the launcher Web API base URL at compile time:
 --dart-define=MOONWELL_API_BASE_URL=https://host
 ```
 
+Set the public AppCast feed URL to enable Windows launcher self-updates:
+
+```powershell
+--dart-define=MOONWELL_APPCAST_URL=https://host/launcher/updates/appcast.xml
+```
+
+The updater is disabled when `MOONWELL_APPCAST_URL` is omitted. Production
+feeds must use HTTPS.
+
 Example run command:
 
 ```powershell
-flutter run -d windows --dart-define=MOONWELL_API_BASE_URL=https://host
+flutter run -d windows --dart-define=MOONWELL_API_BASE_URL=https://host --dart-define=MOONWELL_APPCAST_URL=https://host/launcher/updates/appcast.xml
 ```
 
 ## Development
@@ -67,10 +76,12 @@ pre-commit workflow.
 Build the Windows launcher:
 
 ```powershell
-flutter build windows --dart-define=MOONWELL_API_BASE_URL=https://host
+flutter build windows --dart-define=MOONWELL_API_BASE_URL=https://host --dart-define=MOONWELL_APPCAST_URL=https://host/launcher/updates/appcast.xml
 ```
 
 The Inno Setup installer script lives at `installer/moonwell_launcher.iss`.
+See `docs/launcher_self_update.md` for the AppCast format, signing keys, and
+manual release procedure.
 
 ## Architecture
 
@@ -99,3 +110,4 @@ See `docs/launcher_web_api_spec.md` for the API and sync contract.
 - `docs/project_review.md`: project review with strengths, weaknesses, and
   upgrade feasibility notes
 - `docs/launcher_web_api_spec.md`: current launcher Web API and sync behavior
+- `docs/launcher_self_update.md`: Windows self-update and release operations