Mark WP-0008 finished and move to archived/. Spin flex-auth production gate
to WARDEN-WP-0009. Update SCOPE and reassessment history for R3 reliability.
Add policy.py client that calls flex-auth /v1/check before sign/issue when
policy.enabled is true. Record policy_decision_id in signatures.log. Default
off preserves existing inventory-only behavior. Document production OpenBao
health probe and update config/wiki references.