## Summary
- Agent rename now updates Name field in IDENTITY.md (agent-level + per-user copies for open agents) via both HTTP and WS paths
- Fixes lossy identity rebuild: previous logic reconstructed IDENTITY.md from only Name/Emoji/Avatar, silently dropping LLM-written fields (Creature, Purpose, Vibe, etc.)
- Uses targeted field replacement (bootstrap.UpdateIdentityField) preserving original formatting
- Adds ListUserContextFilesByName to AgentContextStore (PG + SQLite)
- Fixes LastIndex bug in UpdateIdentityField where values containing colons (e.g. Avatar URLs) would break field replacement
- Removes ~335 lines of dead config.json fallback code (agentStore is always set)
- Adds 9 unit tests for UpdateIdentityField covering plain/markdown formats, URLs, edge cases
