diff --git a/.auto/STOP b/.auto/STOP
new file mode 100644
index 00000000..47b48f14
--- /dev/null
+++ b/.auto/STOP
@@ -0,0 +1,3 @@
+/auto kill-switch engaged via .auto/STOP fallback.
+Engaged by chronoai-shining on 2026-06-15 (UTC) at the maintainer's request.
+Delete this file on develop-auto to allow /auto runs to resume (remove before any develop-auto->develop promotion).
diff --git a/.changeset/engage-auto-killswitch.md b/.changeset/engage-auto-killswitch.md
new file mode 100644
index 00000000..fa16abde
--- /dev/null
+++ b/.changeset/engage-auto-killswitch.md
@@ -0,0 +1,4 @@
+---
+---
+
+Ops: engage the /auto kill-switch by landing .auto/STOP on develop-auto. No package change. (#1119)