[client-reliability] client-reliability-9 record normal landing and build evidence

context/CONTEXT_2026-10-22_20-48-00_client-reliability-9.md

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+Client9 HEAD-only fix durably landed f41ac656 after normal435-filegate exit0, ancestry0; sequential build/artifact exit0. Heavy slot released. Await separate bounded native browser slot; no browser started. HLS/torrent/RangeGET and wholeStage3 remain open. No additional product changes.

test_logs/TEST_LOG_2026-10-22_20-48-00_client-reliability-9-landed.md

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+# Client9 HEAD cancellation landing
+
+- Candidate product `e9c960edcf9f4ffd820f17dd6cf9dfe081e6bd29`; merged current unstable `26e9a787cfdc31b77ac35417a5f10e218e2b9662` safely as `09f52bdd5024d8b691500fc8d7181e6fe2a4336f`. Clean tree; `git diff --exit-code e9c960ed HEAD -- js/ui/urlHealthController.js tests/url-health-head-lifecycle.test.mjs` and `git diff --check` exit0 before submission. Initial sandbox merge could not write ORIG_HEAD; identical approved host merge succeeded.
+- Dispatch20:41:26Z and interpreter20:40:54Z granted exclusive normal gate, then sequential build. No parallel heavy job/browser launched. Fleet health checkpoints20:42/43/44/45/47Z: available RAM65-66%, swap51%, maximum observed81.8C; final63.9C. Swap occupancy guidance assessed with dispatch; no system setting/process changes.
+- `env -u NODE_TEST_CONTEXT -u UNIT_TEST_SHARD node tools/fleet/bin/landq.mjs submit` approved host exit0; submission `09f52bdd5024d8b691500fc8d7181e6fe2a4336f`. Unchanged normal install/npm-test gate exit0, landed20:47:18Z as `f41ac656f6d994616ff54b5877934311beecc5e4`. Durable result JSON and host `landq status <id>` agree. Sandbox PID visibility incorrectly reported dead during gating; host status confirmed alive, no second drain started.
+- Independent discovery/log comparison:435discovered/435starts/435unique, missing0/extra0 in lander artifacts/test_unit.log. Gate result exit0 proves completion. `git merge-base --is-ancestor 09f52bdd5024d8b691500fc8d7181e6fe2a4336f unstable` exit0; printed unstable tip f41ac656.
+- `env -u NODE_TEST_CONTEXT -u UNIT_TEST_SHARD npm run build > /tmp/client9-build-20261022.log 2>&1` naturalexit0; deployment artifact verifier passed version markup and hashed references. Own worktree clean after build. Heavy slot released20:48Z; browser slot requested, not started.
+- Earlier focused60/4files,16killed isolated mutants/cancelled0 and lint11 remain recorded evidence; not redundantly rerun. Native browser HEAD lifecycle, actual network bytes/decoder/playback, HLS/torrent/RangeGET, CPU benefit and wholeStage3 remain unverified/open. No remote push/deploy/cloud/signer/credential/scheduler action.

todo/TODO_2026-10-22_20-48-00_client-reliability-9.md

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+- [x] HEAD candidate merged, unchanged normal gate435unique/missing0/extra0 and durable landing f41ac656, ancestry0.
+- [x] Sequential build/artifact exit0; heavy resources released.
+- [ ] Separate allocated native browser HEAD lifecycle smoke and honest limitations.
+- [ ] HEAD slice closure disposition; HLS/torrent separately routed and still open.