Exposes POST /api/v1/platform/account-authority/lookup over the existing
lookup_account_authority service method, gated by a dedicated Hub workload
bearer distinct from end-user OIDC claims and the trusted proxy secret. The
route is absent unless USER_ENGINE_HUB_AUTHORITY_TOKEN is configured.
T02 (root-grant custody/mapping) and the remainder of T03 (real workload
credential admission) depend on decisions outside this repo, per
credential-routing.md and NetKingdom's root-custody canon. Requested via
State Hub messages to net-kingdom and state-hub; workplan set to blocked.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 227621@bnt-lap001
Assistant-Session: ffcc35e9-8ffa-4881-a473-02ca94d6b366
