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/test.yaml

@@ -2,6 +2,7 @@ name: Test
 
 on:
   push:
+  pull_request:
   workflow_dispatch:
 
 jobs:
@@ -10,10 +11,11 @@ jobs:
     runs-on: pi
     steps:
     - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+    - uses: pnpm/action-setup@0977fd99725f1db4007ccb2928dbb4e90d06cc86 # v6.0.10
     - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
       with:
         node-version: '24'
-    - uses: pnpm/action-setup@0977fd99725f1db4007ccb2928dbb4e90d06cc86 # v6.0.10
+        cache: pnpm
     - run: pnpm install --frozen-lockfile
       shell: bash
     - run: pnpm test