Define forge observability evidence

README.md

@@ -24,6 +24,7 @@ Key contracts:
 - `docs/initial-operating-contracts.md`
 - `docs/ci-runner-actions-gitops-ownership.md`
 - `docs/backup-restore-secret-handoff.md`
+- `docs/observability-operating-evidence.md`
 - `docs/gitea-container-registry.md`
 - `docs/gitea-package-registry.md`
 
@@ -31,6 +32,7 @@ Useful entry points:
 
 ```bash
 make registry-docs
+make evidence-docs
 make check-tools
 make gitea-status
 make gitea-deploy