2026-11-03, disposable Linux Boat VM, Codex gpt-6.1-sol through local proxy.
Verification used real web UI, repository playwright-core 1.60.0 and /usr/bin/google-chrome.
No mocked RPC, injected state, replay provider, or imported fixtures.

Baseline:
  git worktree add ../main github/main
  git -C ../main rev-parse HEAD
  61c3794c32b0eeebfac09add43e403618c65d2d7
  vp i
  setsid nohup timeout 7000 vp run dev --no-seed > /tmp/main-dev.log 2>&1 &
  captured PID 19967, serverPort=16733 webPort=8693 baseDir=/home/user/main/.t3

In the UI, added /home/user/browser-stop-app (a real Git repository), selected
Codex GPT-6.1-Sol, and submitted a turn building a Node document reader.
The provider created and committed server.cjs, README.md, .gitignore and started
its real HTTP server on port 4340. /slow-chapter streams chapter paragraphs;
/waiting-chapter waits before headers; /chapter is a complete document.
The same unchanged application and data were used for baseline and PR.

Main UI: opened Browser, navigated to /slow-chapter, clicked Stop once:
  id 4 /slow-chapter request 2026-11-03T06:30:58.018Z
  id 5 /slow-chapter request 2026-11-03T06:31:01.586Z
  id 4 /slow-chapter close   2026-11-03T06:31:01.594Z
Result: Stop restarted the request; control remained Stop and content resumed.
Stopped main's captured process group before starting PR's dev server.

PR:
  git switch -c maria/takeover-pr-29475 28130d337dd868c56378373a2aac2a09488d0f4e
  vp i
  setsid nohup timeout 6500 vp run dev --no-seed --home-dir /home/user/t3code/.t3 > /tmp/dev.log 2>&1 &
  serverPort=13773 webPort=5733 baseDir=/home/user/t3code/.t3
In the UI, added the same real project, selected Codex GPT-6.1-Sol, and sent
another real turn to inspect the reader and curl /chapter. It completed in the
client, reporting the title and routes. No files were changed by this turn.

PR UI /slow-chapter, Stop once:
  id 8 /slow-chapter request 2026-11-03T06:34:02.952Z
  id 8 /slow-chapter close   2026-11-03T06:34:06.491Z
No replacement request during the following 5 seconds. Control returned to
Refresh; partial chapter remained visible without an address-bar error.

Neighbor: idle Refresh, then Stop, then normal navigation:
  id 9 /slow-chapter request 2026-11-03T06:34:30.597Z
  id 9 /slow-chapter close   2026-11-03T06:34:33.150Z
  id 10 /chapter request    2026-11-03T06:34:33.274Z
  id 10 /chapter finish     2026-11-03T06:34:33.275Z
Result: idle Refresh reloads; subsequent Stop cancels; normal navigation works.

Fresh blank tab, first navigation /waiting-chapter, Stop before headers:
  id 11 /waiting-chapter request 2026-11-03T06:35:50.910Z
  id 11 /waiting-chapter close   2026-11-03T06:35:52.827Z
Control returned to disabled Refresh with empty address and the normal
recent-history launcher. No error or replacement request after 6 seconds.
Navigated the same tab to /chapter successfully:
  id 12 /chapter request 2026-11-03T06:35:58.983Z
  id 12 /chapter finish  2026-11-03T06:35:58.983Z

Neighbor: focus streamed canvas, Control+r while loading:
  id 14 /slow-chapter request 2026-11-03T06:37:32.765Z
  id 13 /slow-chapter close   2026-11-03T06:37:32.787Z
Result: reload shortcut still reloads instead of cancelling.

Focused checks via task-owned Blacksmith worker:
  blacksmith-check run --id <task-worker> 'vp i'
  blacksmith-check run --id <task-worker> 'vp test run apps/server/src/preview/ServerBrowser.test.ts apps/server/src/preview/ServerBrowserStream.test.ts apps/desktop/src/preview/Manager.test.ts apps/desktop/src/preview/GuestInput.test.ts'
  Test Files: 4 passed
  Tests: 145 passed
Existing head CI: 28 successful, 0 failing, 0 pending (git.cafe status).
No source changes, commits, or pushes were needed.

Not verified: native Electron guest cancellation, native iOS/Android,
macOS/Windows, desktop-hosted streaming, relay/tunnel or remote environments.
This pass exercised Linux Chrome web-client server-owned streaming.
The previously documented retry-from-Chromium-error-page limitation was not
exercised or changed. These checks do not prove that case or other providers.