Add comprehensive Phase 5 documentation covering credential system implementation with /etc/aitbc/credentials/ directory (700 permissions), runtime secret loading via load-keystore-secrets.sh and systemd ExecStartPre hooks, removal of insecure API_KEY_HASH_SECRET defaults from tenant_context.py and tenant_management.py, keystore permission fixes (all files now 600), and setup_production.py migration from clear text
- Simplify root README to focus on implemented features and quick navigation
- Replace verbose project structure with concise feature list
- Remove recent achievements section (moved to release notes)
- Add direct links to master index and main documentation
- Update MASTER_INDEX.md to focus on documentation catalog
- Remove project completion status (moved to release notes)
- Remove learning path sections (kept in individual path