client-reliability-3: record full 426-file and native browser validation

docs/TODO.md

@@ -16,3 +16,5 @@
 - 2026-10-19: client-reliability-1 and client-reliability-2 finished: durable normal-gate landing de6918ce (submission683cedf0), gate exit0 and unstable ancestry verified. Profile27/27, race1/1 natural exit, lint11/11, full425/425 file exits0; all four mutants rejected. Backlog closed after landing. No unfinished product work for these items; browser/build/real IO unverified (test-only scope). Closure metadata queued separately; see test_logs/TEST_LOG_2026-10-19_20-34-50_client-reliability-landed.md.
 
 - 2026-10-19: client-reliability-3 implemented at current worktree: actual five-card obsolete starts1→0 after last-owner disposal; shared queued/live owners and active probe cache preserved; inflight identity and stale registration guards. Focused25/25 across4 files,11 mutants rejected, lint11/11, build/artifact verification pass, native Chromium/Firefox built-dist lifecycle smoke pass with0 external requests/page errors. Remaining: committed merged-tree full426-file gate, normal landq, durable ancestry/close and dispatch events. Active abort, URL probes, actual media fallback/peers and CPU/RSS unverified/out of scope; entire Stage3 performance plan is not complete.
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+- 2026-10-19: client-reliability-3 ready for normal queue at607d5ce1: full426/426 files exit0 with60s/file bound;27 focused scenarios,14 reverted mutants rejected, lint11/11, build/artifact verification pass. Corrected Chromium/Firefox built-dist/native-observer smoke:0 obsolete starts/stale callbacks/page errors/external requests; hidden reveal and source-health visibility pass. Remaining: normal queue/durable landing/ancestry then close and dispatch landing/final evidence events. Actual playback fallback/live peers, active abort/URL cancellation, CPU/RSS and full Stage3 remain unverified/out of scope.