PR32412 real runtime verification, 2026-11-10 UTC

Environment: disposable Linux x64 X11 VM, Electron44.10.1, Playwright1.60.0.
Real app: UI-created projects pointing at real git worktrees, durable threads,
Codex gpt-6.1-sol through the configured local proxy. No fixtures or mocks.
Google Chrome web UI automation used /usr/bin/google-chrome and repo Playwright.
Native screenshot checks used the actual Electron app and desktop CDP relay.

Baseline: github/main e89abadaee70e0d73fb19a5ce40a686b1a92310e
Separate /home/user/main worktree, vp i. Only one backend at a time.
Original intermittent stall: NOT REPRODUCED.
12 hidden/suspended native screenshots alternating README scrollTop0/500: PASS.
3 issues/root readiness=load roundtrips, immediate screenshot after each load:
issues1 PASS, root1 PASS, issues2 PASS, root2 PASS, issues3 PASS, root3 PASS.

Original PR: 4fa36c54ae2e0d0e30db7983d4da716cfb358e3f
Actual renderer command line includes CDPScreenshotNewSurface.
Real Chrome Codex git-status turn: PASS.
12 hidden/suspended native screenshots alternating scrollTop0/500: PASS.
Independent second-tab URL/content routing: PASS; second tab closed.
3 issues/root readiness=load roundtrips:
issues1 PASS, root1 FAIL, issues2 PASS, root2 FAIL, issues3 PASS, root3 FAIL.
Root error: cdpSession.send: Protocol error (Page.captureScreenshot): Unable to capture screenshot

Fix: 7429d1b26846bdf1fc2fc4afd94ac5b15e7bec22
Keep painting held through two animation frames and one retry ONLY for that error.
Exact fixed native app path, real Codex turn, no caller retries:
issues1 PASS, root1 PASS, issues2 PASS, root2 PASS, issues3 PASS, root3 PASS.
12 additional alternating scrollTop0/500 captures: PASS, all1280x800.
Actual DOM data-preview-rendering=suspended.
Recorded follow-up: issues PASS, root PASS, screenshot saved, no errors/retries.
Main and fixed root screenshot SHA256 both:
0730675205ddf99071315ca14cadaa5a2a984e7337787e9eec4b2181e02162d8

Regression test failed before fix;36 host tests passed after fix.
Remote blacksmith-check command:
vp run check:changed 83a3674ffd84ffb33de768210c806cb1ac53fd80
PASS: format, lint, knip, affected-package typecheck,43tests in2files.

Not verified: intermittent Linux arm64 Wayland/Hyprland stall (main did not fail),
macOS/Windows, native mobile, minimized windows, sandbox-enabled or other GPU paths.
VM Electron required --no-sandbox and has GPU blocklist limitations.