diff --git a/DRIVER-BOARD.md b/DRIVER-BOARD.md
index 9b3cf84..ee585bb 100644
--- a/DRIVER-BOARD.md
+++ b/DRIVER-BOARD.md
@@ -577,3 +577,17 @@ NOTE: Previous runs stored this file as base64, causing 2000-byte truncation. Re
 - **Assessment**: The explain object now has 100+ statistical fields across 2399 lines of aggregator code. The autonomous loop has been running for ~200 runs past any useful workstream. Three consecutive runs have flagged this as bloat; the loop continues anyway due to parallel sessions.
 - **HARD STOP**: This run does NOT add any new metric, ratio, or statistical field. The next autonomous run MUST NOT either. Human direction is required before any new code change is made.
 - **Blockers (unchanged)**: Notion API token invalid (401). Ledger DLQ (ledger.chitty.cc unreachable from container). CI 0-jobs non-CodeQL (recurring, non-blocking).
+
+### 2026-06-16 (10th halt run — awaiting human direction)
+- **Workstream**: Board update only — HARD STOP enforcement (10th consecutive)
+- **Build**: clean | **Tests**: 3290/0/2 (3292 total, 2 skipped)
+- **What was done**:
+  - Startup: npm ci clean, build clean, 3290/0/2 on main (HEAD 07e7bf8 — candidateScoreNonWinnerQMHMGap, 79797979).
+  - Board read from DRIVER-BOARD.md (Notion 401 — recurring).
+  - Open PRs awaiting human action: #752 (7th halt), #754 (8th halt), #755 (9th halt — DO NOT merge autonomously). PR #504 (ChittyConnect registration) — DO NOT auto-merge.
+  - Since 9th halt (tests 3290/0/2), tests unchanged — no new metrics merged this cycle.
+  - 662+ stale auto/ branches on remote (metric bloat branches never cleaned up).
+  - No new code changes made this run. No new metrics, ratios, or statistical fields added.
+- **HARD STOP (10th)**: All original workstreams A–E are DONE. The autonomous loop has no remaining valid workstreams. Human action is required to either (a) define new workstreams in this board, (b) prune `cast explain` bloat (100+ fields → ≤10 + verbosity param), (c) update the driver scheduler prompt to block new `cast explain` metrics, or (d) disable the hourly scheduler. Until then, autonomous runs will only update this board and notify — no code changes.
+- **Push notification sent**: yes (2026-06-16 run)
+- **Blockers (unchanged)**: Notion API token invalid (401). Ledger DLQ (ledger.chitty.cc unreachable). CI 0-jobs non-CodeQL (non-blocking).