fix: stop orphaned URL mirror continuation (client-reliability-5)

docs/TODO.md

@@ -22,6 +22,8 @@
 
 ## client-reliability
 
+- 2026-10-20: item5 routed controller-only pre-candidate guard implemented; baseline16pass/2fail→fixed18/18 lifecycle,6 rejected/reverted mutants,focused28/4files,lint11/build+artifact pass. No full/browser launch while dispatch administrative drain/QA reservation holds; slot requested13:32:54UTC,await explicit grant and verified unstable merge. No active abort/observer/cache/limits change; actual fallback/CPU unverified. Unique integrity/evidence in test_logs/*client-reliability-5*.
+
 - 2026-10-20: item5 investigation at0c1dd7e8:active URL success/real4000ms controlled timeout release media/slot correctly;disposed active primary media error starts1 obsolete mirror HEAD(expected0),strict assertion naturally exits1 after cleanup/retry. Shared/rejoin owner and later same-source controls pass. Proposed controller-only pre-candidate ownership guard + focused tests; await dispatch routing. No product/tests changed; active abort/browser/fallback/CPU unverified. See test_logs/TEST_LOG_2026-10-20_13-30-00_client-reliability-5.md.
 
 - 2026-10-20: item4 done/closed after normal landing89ccb907(submission7055496b,gate exit0,unstable ancestry exit0). Full427/427 files,focused22,lifecycle12,13 reverted mutants,lint11,build/artifact/native Chromium+Firefox controlled IO pass;obsolete starts1→0. Dispatch landing event sent; preview refresh owned by dispatch. No further item without routing. Actual media fallback/live peers/active abort/CPU and whole Stage3 unverified. Closure metadata/final event follow.