- Update go.mod and Dockerfile to Go 1.26
- Apply `go fix ./...` stdlib modernizations across 170+ files
- Add `go fix` to post-implementation checklist in CLAUDE.md
- Fix go fix misapplied rewrite in loop_history.go
- Add query="*" to list all entities for discovery
- Show top 10 entities as hints when search returns no results
- Display entity names instead of UUIDs in relation output
- Enable KG tool by default (admin still configures extraction settings)
- Tune force-directed graph layout: add forceX/forceY gravity to keep clusters compact