docs: migrate repository guidance to Gitea

.antigravityrules

@@ -6,7 +6,8 @@ All AI agents (including Cline, Antigravity, Cursor, and Copilot) must adhere to
    - The overall project code coverage (Statements, Lines, and Functions) must be maintained at **80% or higher**.
    - Verify coverage by running:
      ```bash
-     bun run test --watch=false --coverage
+     bun scripts/generate-langs.js
+     NODE_OPTIONS=--max-old-space-size=2048 bunx vitest run --coverage --maxWorkers=1 --exclude='src/app/benchmark/**'
      ```
    - If your changes introduce new code or modify existing code in a way that drops the coverage below 80%, you must write appropriate unit tests in `.spec.ts` files to bring it back up.
 
@@ -24,10 +25,11 @@ All AI agents (including Cline, Antigravity, Cursor, and Copilot) must adhere to
      bun run build
      ```
 
-4. **GitLab Pipeline Checks**:
-   - You must execute the local equivalent of the GitLab CI/CD pipeline steps before completing your task. All of the following commands must pass:
+4. **CI Checks**:
+   - You must execute the local validation commands before completing your task. CI conversion to Gitea Actions is tracked in issue #268; the preserved `.gitlab-ci.yml` is a migration reference, and local checks do not satisfy Gitea's migration gate. All of the following commands must pass:
      - **Linting check**: `bun run lint` (or use `bun run lint:fix` to resolve auto-fixable issues)
      - **Formatting check**: `bun run format:check`
-     - **TypeScript Type check**: `bunx tsc --noEmit`
-     - **Unit Tests and Coverage**: `bun run test --watch=false --coverage`
+     - **TypeScript Type check**: `bunx tsc --noEmit -p tsconfig.app.json` and `bunx tsc --noEmit -p tsconfig.spec.json`
+     - **Unit Tests and Coverage**: generate the language registry, then run the coverage command in rule 1, matching the preserved functional-test job.
      - **Production Build**: `bun run build -- --configuration production`
+   - The separate performance benchmark remains advisory while issue #78 is open. Run it outside coverage with `NODE_OPTIONS=--max-old-space-size=2048 bunx vitest run src/app/benchmark/leave-planner-benchmark.spec.ts --maxWorkers=1` when verifying performance; see `docs/benchmark/README.md`.