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

docs/index.md

@@ -24,6 +24,12 @@
 | [Evidence Guide](evidence-guide.md) | Evidence packages, cold archives, selective disclosure, chain anchoring, legal discovery workflow. |
 | [Source Drop Box](source-dropbox.md) | Anonymous file intake: tokens, EXIF pipeline, receipt codes, operational security. |
 
+## Security
+
+| Document | Description |
+|---|---|
+| [Threat Model](security/threat-model.md) | Adversary model, security guarantees, non-guarantees, cryptographic primitives, key management, known limitations. |
+
 ## Architecture (Developer Reference)
 
 | Document | Description |
@@ -32,3 +38,12 @@
 | [Chain Format Spec](architecture/chain-format.md) | CBOR record format, entropy witnesses, serialization, storage format, content types. |
 | [Export Bundle Spec](architecture/export-bundle.md) | FIELDWITNESSX1 binary format, envelope encryption (X25519 + AES-256-GCM), Merkle trees. |
 | [Federation Protocol Spec](architecture/federation-protocol.md) | CT-inspired server protocol: API endpoints, gossip, storage tiers, receipts, security model. |
+
+## Planning
+
+| Document | Description |
+|---|---|
+| [Why FieldWitness](planning/why-fieldwitness.md) | Problem statement, positioning, scenarios, and technical overview for non-technical audiences. |
+| [C2PA Integration](planning/c2pa-integration.md) | C2PA bridge architecture, concept mapping, implementation phases, privacy design. |
+| [Packaging Strategy](planning/packaging-strategy.md) | Hosted demo, standalone binary, mobile app, and onboarding flow design. |
+| [GTM Feasibility](planning/gtm-feasibility.md) | Phased plan for credibility, community engagement, funding, and field testing. |