feat: automate dist recompilation on Renovate PRs and configure concurrency limit (#120)

### Summary of Changes

1. **Gitea Workflow (.gitea/workflows/recompile-dist.yaml)**:
   - Automates recompilation of dist/index.js on Renovate PRs.
   - Adds loop-prevention check for [skip compile].
2. **Renovate Configuration (
enovate.json)**:
   - Configures branchConcurrentLimit: 2 and prConcurrentLimit: 2.
   - Adds gitIgnoredAuthors for automated bot commits.
   - Adds rebaseWhen: 'behind-base-branch'.
   - Removes postUpgradeTasks.
3. **Test Workflow (.gitea/workflows/test.yaml)**:
   - Added pull_request trigger.
4. **Gitea-Only Setup**:
   - Removed .github/ workflows to keep workflow execution strictly on Gitea.
5. **Preferences (GEMINI.md)**:
   - Documented strict pnpm/pnpx rule.
6. **Tests**:
   - Added afterEach import in __tests__/index.test.js.

Reviewed-on: #120
Reviewed-by: LLMReview <27+autoreview@noreplay.horstenkamp.eu>

.gitea/workflows/recompile-dist.yaml

@@ -0,0 +1,55 @@
+name: Recompile dist/ on Renovate PR
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+    paths:
+    - package.json
+    - pnpm-lock.yaml
+    - index.js
+    - monitor.js
+
+permissions:
+  contents: write
+
+jobs:
+  recompile:
+    runs-on: pi
+    if: |
+      (github.actor == 'renovate[bot]' || contains(github.head_ref, 'renovate/')) &&
+      !contains(github.event.head_commit.message, '[skip compile]')
+    steps:
+    - name: Checkout PR Branch
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1   # v7.0.1
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        ref: ${{ github.head_ref }}
+        fetch-depth: 0
+
+    - uses: pnpm/action-setup@0977fd99725f1db4007ccb2928dbb4e90d06cc86   # v6.0.10
+
+    - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020   # v7.0.0
+      with:
+        node-version: '22'
+        cache: pnpm
+
+    - name: Clean Install
+      run: pnpm install --frozen-lockfile --ignore-scripts
+      shell: bash
+
+    - name: Build
+      run: pnpm run build
+      shell: bash
+
+    - name: Commit dist/
+      run: |
+        git config user.name "github-actions[bot]"
+        git config user.email "github-actions[bot]@users.noreply.github.com"
+        git add dist/
+        if git diff --staged --quiet; then
+          echo "No changes to dist/"
+        else
+          git commit -m "chore: compile action bundle [skip compile]"
+          git push origin HEAD:${{ github.head_ref }}
+        fi
+      shell: bash