[teamleaderleo]

Summary

agent-pane-seen.test.ts went red on unrelated feat-cmux-next PRs: #19881, #19883, #19885 and #19831 in the last 6 h, 4 of the last 10 react-apps-check runs. Both cases failed together:

• the pane tells acpmux whether it shows its chat: attach undefined at line 132. The test gave the first page 10 s to attach. Since ci: webviews dev server files run at once, each on its own warm Vite cache (no bead) #19831, dev server files run side by side, and on a busy runner the first page's cold modules load slowly, so its attach came later than that.
• a pane hidden while its attach is in flight …: a knock-on failure. The first case threw before closing its page, so that page's late attach took the second case's held attach slot.

Fix:

• The first attach gets 60 s; later waits keep their 10 s.
• Each case closes its page even when it fails, so one failure can't cascade into the next case.
• Red test: the stand-in daemon answers the first initialize after 11 s, reproducing the slow first page.

Testing

• Red then green in this PR's react-apps-check: the red commit adds only the 11 s cold start.

Changelog

none

🤖 Generated with Claude Code

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Summary by cubic

Stabilizes the agent-pane-seen.test.ts flake on busy CI runners, where the first page's attach could arrive after the 10 s wait and its unclosed page would then steal the next test case's held-attach slot.

• The first attach now gets 60 s; later waits keep their 10 s.
• Each test case closes its page on failure, so one failure can't cascade into the next.
• The red commit reproduces the slow cold start by answering the first initialize after 11 s.

^{Written for commit 8e632dc. Summary will update on new commits.}

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[github-actions]

Passes: CI passes on 8e632dca09.

CI passes on 8e632dca09 (run 38263785398 attempt 1).

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

[github-actions]

CI fast guards passes on 8e632dca09 (https://github.com/manaflow-ai/cmux/actions/runs/38263785398). This covers only the fast guards, not CI: CI's result is the ci-status check, and the CI failure attribution comment names any failing test.