Add GitHub Actions CI workflow for lint and test

Runs flutter analyze (fatal warnings/infos) and flutter test --coverage
on push/PR to main, master, and develop branches. Uses Flutter 3.41.6
(from .fvmrc) with dependency caching and uploads coverage artifact.

https://claude.ai/code/session_011cEYpuo76EMamkGvpnuPNZ

Author: claude

.github/workflows/ci.yml

@@ -0,0 +1,56 @@
+name: CI
+
+on:
+  push:
+    branches: ["main", "master", "develop", "claude/**"]
+  pull_request:
+    branches: ["main", "master", "develop"]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  analyze:
+    name: Lint & Analyze
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: "3.41.6"
+          channel: "stable"
+          cache: true
+
+      - name: Install dependencies
+        run: flutter pub get
+
+      - name: Run analyzer
+        run: flutter analyze --fatal-infos --fatal-warnings
+
+  test:
+    name: Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: "3.41.6"
+          channel: "stable"
+          cache: true
+
+      - name: Install dependencies
+        run: flutter pub get
+
+      - name: Run tests
+        run: flutter test --coverage
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-report
+          path: coverage/lcov.info
+          retention-days: 7