docs(issues): capture the #290 recurrence playbook — window unconfirmed, reporter-stranding mechanism first

[BigSimmo]

Summary

• One merge-safe ledger inbox capture (docs/outstanding-issues-inbox/bbf8ba3d….json, P3 rec) recording what an independent second look at archived #290 established, so it survives the session. Reconcile with npm run issues:reconcile after landing.
• The archive's "resolved by drift" story is corrected: the bad SHA itself passes. In a fresh container (pinned Chromium 1234 installed per #312), the exact commit where #290 measured 2/5–3/5 failures — 9ab3b73ad — passed 30/30 executions: reproducer isolated ×5 (5 passed (10.4s), ~1.0s each), full tests/ui-smoke.spec.ts --project=chromium (98 passed (2.5m), 0 flaky), and reproducer ×10 under deliberate CPU contention (6 busy-loops on 4 cores; 10 passed (28.6s)). Current main (a76f280) also 5 passed (11.2s). So the failure was machine/environment-specific and the e8adde1b9..9ab3b73a regression window is unconfirmed. Also posted on PR docs(issues): close #290 as not-reproducible over three full ui-smoke runs, capture the browser-preflight traps (#312) #1884.
• On recurrence, the row says to test the stranding mechanism before re-bisecting:computeScrollHideUpdate re-evaluates only on scroll/resize events, and its viewportHeightChanged/range-change guards deliberately zero accumulated down-travel — geometry churn consuming a gesture's final steps strands the not-hidden state permanently, matching the recorded ~11.5s timeout signature. Fastest confirmation is a page.on("console") guard trace. The old window's content-bisect axes are preserved in the row for that day; a stop rule forbids speculative guard changes (protected phone chrome, contract-tested) without a failing trace.

Verification

• npm run verify:pr-local

- completed: check:runtime, check:installed-lock-parity, format:changed, sitemap:check,
docs:check-index, docs:check-inventory, docs:check-scripts, docs:check-links,
check:branch-review-ledger, check:outstanding-issues, check:ledger-write-discipline
- failed: (none)
- not reached: (none)

Ledger inbox check passed: 1 pending request(s), 0 applied.
Outstanding-issues guard passed: 310 rows (114 open, 196 archived), unique ids,
next-id=313 above the highest, no merge driver, no ids deleted from base 0709965e66e0.

Docs-only diff (one inbox JSON); no src/ change, so no UI gate is owed — the Playwright evidence quoted above is the measurement the row records, run before this diff existed.

Risk and rollout

• Risk: none to the product — a single ledger inbox capture; no id allocated until reconcile, so no collision risk with concurrent branches.
• Rollback: git revert the single commit.
• Provider or production effects: None. The only network access in the session was a Playwright browser download and the GitHub reads/comment noted above.

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