phase9: ledger — cycle-4 close: 400-body milestone met

phase-ends/CURRENT_PHASE.md

@@ -747,3 +747,23 @@ makes the team structure work.
   stopped); protecting the merge/gate/ledger role. Ledger + documented
   merge flow are the replacement-coordinator handover.
 - Registry: 401 / 392 — 8 short of the 400-body milestone. All gates green.
+
+## 🌟 CYCLE 4 MILESTONE MET — 400 distinct bodies
+
+| Cycle | New bodies | Total bodies | New regions | Total regions | Result |
+|---|---|---|---|---|---|
+| c4 CLOSE | +102 | **400** | +102 | **409** | **MILESTONE MET**, gate MATCH |
+
+- **400 distinct bodies reached** (409 regions) on the coordinator's own
+  whole-binary gate — the plan's P9-T6 checkpoint (≥251 new / 400 total)
+  is met. SHA-1 e173426c157384ebf1b6caf8c6fea18a85a14af9 stable.
+- Worker B's milestone-close run: 11 consecutive first-attempt family
+  closes (family-as-a-set lever, stable positions + per-row re-reads),
+  47 new bodies in cycle 4, then rotated cleanly with the record handoff
+  (60 claims gated, 104 report entries, 5 cookbook corrections, 3
+  encoding-trap synthesis).
+- All plans' staged milestones now met: P9-T2 (180) ✓, P9-T3 (230) ✓,
+  P9-T4 (290) ✓, P9-T6 (400) ✓. Remaining: P9-T7 headroom (500 target),
+  P9-T8 phase-close docs.
+- Next: coordinator-facing phase-close — cookbook/conventions/verification
+  records, negatives index extraction, clean gate review.