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