chore(agents): implement v2 hardening and enforcement-ready QA

.agents/skills/core-guardrails/references/quality-gates.md

@@ -5,6 +5,12 @@
 1. `docker compose exec php vendor/bin/phpunit`
 2. `docker compose exec php vendor/bin/phpstan analyse -c phpstan.neon --no-progress`
 3. `docker compose exec php vendor/bin/phpunit tests/Architecture/CoreStarterkitContractTest.php`
+4. `docker compose exec php vendor/bin/php-cs-fixer fix --config=tools/php-cs-fixer/.php-cs-fixer.dist.php --dry-run --diff --verbose`
+5. `bin/docs-link-check.sh`
+6. `bin/codex-skills-sync.sh --check`
+
+Policy-Hinweis:
+- Verbindliche Enforcement-Einteilung (`required`, `manual_non_blocking`, `periodic_non_blocking`) wird zentral in `/.agents/checks/enforcement-policy.json` gepflegt.
 
 ## Struktur-Gates (schnell)