docs: Add Gitea API automation guide to AGENTS.md and CLAUDE.md

Enhance project governance with CI/CD automation capabilities:

AGENTS.md additions:
- v16.0 Gitea API & CI/CD Automation section
- Environment setup (GITEA_TOKEN_TAXBAIK)
- Common API patterns (PR comments, labels, releases)
- Gitea Actions workflow integration
- Automation best practices (labels, milestones, release tagging)

CLAUDE.md additions:
- Gitea API setup instructions
- Practical automation tasks (build verification, auto-labeling, debt tracking)
- Gitea Actions integration example for PR verification

This enables:
- Automated PR verification comments with test results
- Auto-labeling by affected modules
- Tech debt tracking via issue linking
- Release management automation
- CI/CD pipeline transparency

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -452,6 +452,69 @@ Before writing code, verify:
 - **Non-value-loss sell:** Requires ReentryWatch, new CycleId/Lot, step intervals, expiry, dedup.
 - **Activation gating:** Requires ModelCard, OOS/PBO/DSR evidence, maker-checker approval, effective_at, rollback justification.
 
+## Gitea API Automation (Optional but Recommended)
+
+### Environment Setup
+
+```bash
+# Enable Gitea API automation (optional)
+$env:GITEA_TOKEN_TAXBAIK = "your-gitea-api-token"  # Windows PowerShell
+export GITEA_TOKEN_TAXBAIK="your-gitea-api-token"  # macOS/Linux
+```
+
+### Common Tasks
+
+**1. Verify PR Build Status**
+```bash
+# After successful build/test, comment on PR:
+curl -X POST \
+  -H "Authorization: token $GITEA_TOKEN_TAXBAIK" \
+  -H "Content-Type: application/json" \
+  -d '{"body":"✅ Build: PASS\n✅ Tests: 41/41 PASS\n✅ Security: Clean"}' \
+  https://gitea.taxbaik.com/api/v1/repos/kjh2064/KArtSell.Aegis/issues/{PR_NUMBER}/comments
+```
+
+**2. Auto-Label PRs by Module**
+```bash
+# Label PR with affected modules
+curl -X POST \
+  -H "Authorization: token $GITEA_TOKEN_TAXBAIK" \
+  -d '["architecture","performance","observability"]' \
+  https://gitea.taxbaik.com/api/v1/repos/kjh2064/KArtSell.Aegis/issues/{PR_NUMBER}/labels
+```
+
+**3. Link to Tech Debt Registry**
+```bash
+# Reference debt in commit message (e.g., in CI job):
+git commit -m "fix: CA1822 static method hints - TECH-001
+
+Resolves technical debt from NoWarn bypass.
+Part of quarterly paydown target (20% per quarter).
+
+Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>"
+```
+
+**4. Gitea Actions Integration** (`.gitea/workflows/ci.yml`)
+```yaml
+- name: Post PR verification results
+  if: always()
+  run: |
+    BODY="## Verification Results
+    - Build: ${{ job.status }}
+    - Tests: 41/41 ✅
+    - Debt Paydown: TECH-001 resolved
+    
+    [See full logs](https://gitea.taxbaik.com/kjh2064/KArtSell.Aegis/actions)"
+    
+    curl -X POST \
+      -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+      -H "Content-Type: application/json" \
+      -d "{\"body\":\"$BODY\"}" \
+      https://gitea.taxbaik.com/api/v1/repos/kjh2064/KArtSell.Aegis/issues/${{ github.event.pull_request.number }}/comments
+```
+
+---
+
 ## Tools & Scripts
 
 ### Scaffolding