Merge branch 'unstable' into area/storage-cors

todo/TODO_2026-10-20_13-58-00_client-reliability-5-landed.md

@@ -0,0 +1,7 @@
+# Item5
+
+- [x] Reproduce/route/controller6line guard+six regressions/six mutants.
+- [x] Focused28/lifecycle18/full427files/lint11/build/artifact/browser smoke.
+- [x] Normal product landing0bd0b1c3/durable status/ancestry/backlog close.
+- [x] Product event and expensive/browser slot release.
+- [ ] Docs-only closure landing/final dispatch event,then idle.