Changed HKDF expand info strings to match featherChat's identity.rs:
- "warzone-ed25519-identity" → "warzone-ed25519"
- "warzone-x25519-identity" → "warzone-x25519"
Same BIP39 seed now produces identical Ed25519/X25519 keypairs in both
featherChat and WZP. This is the prerequisite for shared identity.
Also added FEATHERCHAT_INTEGRATION.md (1209 lines) from featherChat repo
documenting the full integration plan with confirmed code references.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ac3b997758