Add three approved requirements documents for dcy-011: - REQ-052: User-owned credential management API (Interface) - REQ-053: Admin daemon CRUD API (Interface) - REQ-054: Credential management security with write-only constraint (Non-Functional) Update discovery document to reference generated requirements and update index with new REQ IDs and Change Log. Scope: Self-service credential management + admin daemon CRUD + security-isolated API for portfolio-hub. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VHtM5Ws1HKCKQ4JGi6GRb5