- Add raft-cluster-status overview (C3a/C3b/post-C3b shipped on main)
- Mark C3a/C3b design+plans done; refresh operator docs en/bg
- CHANGELOG 1.2.0 Raft section; README cluster example and status line
- monitoring.md health/metrics match real HTTP port+440 and raft series
Mark the C3b design done; document leader-only DML, env vars, and default-DB
apply limits in en/bg distributed docs; refresh the README raft status line.