Update docs for v0.3.0 and bump attest module to v0.2.0

- Bump attest subpackage version from 0.1.0 to 0.2.0
- Add c2pa_bridge/ module to CLAUDE.md architecture tree
- Add security/ and planning/ docs to CLAUDE.md and docs/index.md
- Update federation architecture doc version to 0.3.0
- Verify zero remaining old branding references across all docs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/architecture/federation.md

@@ -1,7 +1,7 @@
 # Federated Attestation System — Architecture Overview
 
 **Status**: Design  
-**Version**: 0.1.0-draft  
+**Version**: 0.3.0  
 **Last updated**: 2026-04-01
 
 ## 1. Problem Statement