docs: raft cluster status, plans closed, CHANGELOG/README/monitoring

- 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

docs/superpowers/specs/2026-07-30-raft-cluster-status.md

@@ -0,0 +1,62 @@
+# Raft Cluster Status — C3a / C3b / post-C3b
+
+Date: 2026-07-30  
+Status: **Shipped on `main`** (tip includes metrics).  
+Branch: all work merged to `main` only (feature branch removed).
+
+## Phase map
+
+| Phase | Spec / plan | Status | What landed |
+|-------|-------------|--------|-------------|
+| **C3a** Network bootstrap | `raft-network-bootstrap-design.md` + plan | **Done** | `id@host:port` peers, election timer in production, AppendEntries resets timer, `dataDir` persistence, partial-read frames, `tests/raft_e2e_test.nim` |
+| **C3b** SQL writes | `raft-sql-writes-design.md` + plan | **Done** | `isWrite`, follower reject / forward, leader append+wait-commit, rich apply (LSM+index+graph), multi-stmt gate, default-DB only, `tests/raft_writes_e2e_test.nim` |
+| **C3c-lite** DDL + ops | (this status doc) | **Done** | DDL via `ddl` log entries; leader forwarding (`BARADB_RAFT_CLIENT_PEERS`); safe log compact + snapshot metadata; Prometheus + `/health` raft |
+
+## Key commits (main)
+
+| Commit (short) | Summary |
+|----------------|---------|
+| C3a series | peers, timer, frames, e2e election |
+| `38c1c01`…`a462d21` | C3b classification → append → e2e → docs |
+| `0d51497` | multi-stmt gate, rich apply, delete kv |
+| `50f827f` | graph apply, non-default DB reject |
+| `095698b` | DDL through raft |
+| `9df8316` | leader write/DDL forwarding |
+| `53704e1` | safe log compaction + snapshot base |
+| `1b3c261` | raft metrics on `/metrics` + `/health` |
+
+## Production behavior (summary)
+
+1. Enable with `BARADB_RAFT_*` env (see `docs/en/distributed.md`).
+2. Cluster elects a leader over TCP; state in `dataDir/raft/raft_state.bin`.
+3. DML/DDL on **default** DB only: leader appends, waits for majority, returns.
+4. Followers forward to leader if `BARADB_RAFT_CLIENT_PEERS` is set; else `not leader`.
+5. Apply updates LSM + secondary engines; DDL re-executes SQL on each node.
+6. Log soft-cap via safe prefix compact; metrics on HTTP port `BARADB_PORT+440`.
+
+## Explicit non-goals still open
+
+- Multi-database raft (only `default`)
+- `CREATE`/`DROP DATABASE` replication
+- Membership change (join/leave) protocol
+- InstallSnapshot with full SM / LSM payload (v1 uses safe-prefix compact only)
+- Raft port TLS / mutual auth
+- Read consistency levels (read-your-writes, linearizable reads on followers)
+- Automatic client redirect without `CLIENT_PEERS`
+
+## Tests
+
+| Suite | Covers |
+|-------|--------|
+| `tests/raft_e2e_test.nim` | 3-process election + failover |
+| `tests/raft_writes_e2e_test.nim` | DDL + DML replicate, forward, index SELECT, failover writes |
+| `tests/test_all.nim` | in-process raft, append/wait, compact, metrics |
+| `tests/tla_faithfulness.nim` | ElectionSafety, LogMatching, … |
+| `tests/bugfix_test.nim` | peers / client peers / isWrite / isRaftDdl |
+
+## Docs to keep in sync
+
+- `docs/en/distributed.md` / `docs/bg/distributed.md` — operator guide
+- `docs/en/monitoring.md` — health/metrics (raft section)
+- `CHANGELOG.md` — `[1.2.0] Unreleased` Raft section
+- README raft status line