Gate auto sync with network reachability checks

docs/progress.md

@@ -2,6 +2,33 @@
 
 Updated: 2026-02-15
 
+## Latest Milestone (2026-02-15): Reachability-Gated Auto Sync
+
+Added connectivity-aware gating to background sync auto-triggers:
+
+- Added network reachability abstraction:
+  - `lib/core/network/reachability/network_reachability.dart`
+  - `lib/core/network/reachability/network_reachability_provider.dart`
+  - platform impls:
+    - `network_reachability_io.dart`
+    - `network_reachability_web.dart`
+    - `network_reachability_stub.dart`
+- Integrated into background sync runner:
+  - `lib/features/sync/sync_background_runner.dart`
+  - auto-triggers now skip when reachability gate reports offline (REST mode)
+  - fake backend mode bypasses reachability gate
+- Extended sync trigger controller:
+  - `lib/features/sync/sync_auto_trigger_controller.dart`
+  - added trigger gate callback support
+- Added tests:
+  - `test/features/sync/sync_auto_trigger_controller_test.dart`
+  - validates denied-trigger behavior
+
+Validation for this milestone:
+
+- `flutter analyze` -> pass
+- `flutter test` -> pass
+
 ## Latest Milestone (2026-02-15): App Session Flow Test Coverage
 
 Added higher-level widget coverage for a core authenticated user journey:
@@ -132,7 +159,8 @@ Validation for this milestone:
 2. Conflict resolution UX:
    - reject/requeue is implemented; still missing guided per-entity repair UI.
 3. Sync trigger maturity:
-   - connectivity-aware triggers are still missing.
+   - implemented via reachability gating; future improvement is explicit OS
+     connectivity event subscription.
 4. Test depth:
    - add integration tests for auth + sync + CRUD end-to-end app flows.