ci: re-enable macos, bust poisoned rust-cache

Author: boxerab

.github/workflows/ci.yml

@@ -17,10 +17,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Linux-only for now. Windows (Unix-only trigger.rs) and macOS (build
-        # not yet green) are unverified. Tracked as Phase 5 work.
+        # Windows omitted: the socket trigger (trigger.rs) is Unix-only, so the
+        # app doesn't compile there yet. Tracked as Phase 5 work.
         platform:
           - { os: ubuntu-latest, label: ubuntu }
+          - { os: macos-latest,  label: macos }
 
     steps:
       - uses: actions/checkout@v4
@@ -59,7 +60,9 @@ jobs:
         uses: Swatinem/rust-cache@v2
         with:
           workspaces: ./src-tauri -> target
-          shared-key: ${{ matrix.platform.label }}
+          # -v2 busts a poisoned macos cache (restored dep fingerprints without
+          # their rlibs, so qol built with no deps in scope). Bump to re-bust.
+          shared-key: ${{ matrix.platform.label }}-v2
 
       # ──────────────── frontend (needed for tauri::generate_context!) ────────────────
       - name: Install deps