Add platform-secret playbooks for issue-core ingestion, OpenRouter llm-connect,
object-storage STS, and database dynamic credentials. Extend the routing catalog
with draft entries and implement `warden route list --stale` for quarterly drift
review. Document the review cadence in AccessRouting and mark the workplan finished.
Agents can discover the activity-core → issue-core emission contract via
`warden route show activity-core-issue-sink` instead of messaging ops-warden
for ISSUE_CORE_API_KEY. The playbook points at owner-repo docs per the
no-double-source rule.