- 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
If probeBotInfo fails (missing bot:read permission), botOpenID is empty
and mention detection always returns false — causing all group messages
to be silently recorded to history instead of processed.
Now treats any mention as bot mention when botOpenID is unknown.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>