diff --git a/REPORT.md b/REPORT.md
index 40d374a..d866ac1 100644
--- a/REPORT.md
+++ b/REPORT.md
@@ -1,3 +1,11 @@
+# ADDENDUM — v0.266.0: a failed install removes what it started (R-649, operator ruling, 2026-09-23)
+
+`964ae75`. MinAgent 0.131.0. `compose down` (volumes kept) on the deploy's failure branch. Red-proof seen
+failing; live on 9202: 0 containers left, volumes kept. Floor 0.266.0. Evidence:
+`felhom.eu/documentation/audits/r649-2026-09-23/`.
+
+---
+
 # REPORT — controller v0.265.0: R-634's cause fixed, held apps say so, the OOM storm (2026-09-23)
 
 R-634, R-625, R-636, R-647. Commit `0054d4b`. MinAgent 0.131.0 (unchanged). Needs hub v0.121.0 (deployed