chore: consolidate post-stop research artifacts

reports/README.md

@@ -25,3 +25,19 @@ in Git history if a forensic reconstruction is ever necessary.
 
 The initial untracked `backtest-20260712-sr-detector-rewrite.json` is local-only
 and is intentionally not part of the repository.
+
+The 2026-07-17 post-stop re-entry decision is preserved in
+`daily_reentry_matrix.json`. It is the canonical source for the nine-policy
+daily replay, production-like full-universe ranking, the disjoint 2025+ book,
+and the cost/capacity sensitivity matrix. The interpretation and production
+decision live in
+[`docs/research/post-stop-reentry.md`](../docs/research/post-stop-reentry.md).
+
+The earlier `post-stop-reentry-20260717.json`,
+`post-stop-cooldown-sweep-20260717.json`, and
+`gate-protected-stop-20260717.json` reports were removed as superseded
+intermediate experiments. They used weekly/hybrid entry cadence or tested the
+rejected stop-adjustment path, and add no decision evidence beyond the final
+daily matrix and narrative. Their matching one-off runners were removed too.
+All remain recoverable from Git history. Rebuildable candidate pickle caches
+are intentionally ignored and must not be committed.