feat(canonical-controls): Canonical Control Library — rechtssichere Security Controls

Eigenstaendig formulierte Security Controls mit unabhaengiger Taxonomie
und Open-Source-Verankerung (OWASP, NIST, ENISA). Keine BSI-Nomenklatur.

- Migration 044: 5 DB-Tabellen (frameworks, controls, sources, licenses, mappings)
- 10 Seed Controls mit 39 Open-Source-Referenzen
- License Gate: Quellen-Berechtigungspruefung (analysis/excerpt/embeddings/product)
- Too-Close-Detektor: 5 Metriken (exact-phrase, token-overlap, ngram, embedding, LCS)
- REST API: 8 Endpoints unter /v1/canonical/
- Go Loader mit Multi-Index (ID, domain, severity, framework)
- Frontend: Control Library Browser + Provenance Wiki
- CI/CD: validate-controls.py Job (schema, no-leak, open-anchors)
- 67 Tests (8 Go + 59 Python), alle PASS
- MkDocs Dokumentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -169,6 +169,22 @@ jobs:
           pip install --quiet --no-cache-dir pytest pytest-asyncio
           python -m pytest test_main.py -v --tb=short
 
+  # ========================================
+  # Validate Canonical Controls
+  # ========================================
+
+  validate-canonical-controls:
+    runs-on: docker
+    container: python:3.12-slim
+    steps:
+      - name: Checkout
+        run: |
+          apt-get update -qq && apt-get install -y -qq git > /dev/null 2>&1
+          git clone --depth 1 --branch ${GITHUB_REF_NAME} ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+      - name: Validate controls
+        run: |
+          python scripts/validate-controls.py
+
   # ========================================
   # Build & Deploy auf Hetzner (nur main, kein PR)
   # ========================================
@@ -181,6 +197,7 @@ jobs:
       - test-python-backend-compliance
       - test-python-document-crawler
       - test-python-dsms-gateway
+      - validate-canonical-controls
     container: docker:27-cli
     steps:
       - name: Deploy