PR: https://git.cafe/pingdotgg/t3code/pulls/29247
Candidate: d8543e908031e0df04fe3742eea940cf2da0c284
Baseline: github/main a03648901640216a154d387cfb2cdec268e6527e
Linux x86_64, real Electron 44.10.0, real built server/client.
Real installed /usr/bin/update-desktop-database delayed by strace for 4s at exec return; no helper replacement or mocked provider.
Chromium --no-sandbox was required for the traced disposable-VM launch; sandbox-enabled startup is not covered.

BASELINE
23:03:26.198 app ready / safe storage ready
23:03:26.223 real update-desktop-database exec (DELAYED)
23:03:30.242 helper exited 0
23:03:30.282 registered URL scheme handler
23:03:30.284 bootstrap start
23:03:30.552 backend start requested
23:03:30.632 main window created
23:03:34.328 backend ready
xdg-mime query default x-scheme-handler/t3code => com.t3tools.T3Code.desktop
The client rendered the real Codex gpt-6.1-sol reply: linux startup verification passed.

CANDIDATE
23:10:20.340 app ready / safe storage ready
23:10:20.350 bootstrap start
23:10:20.576 backend start requested
23:10:20.781 main window created
23:10:20.857 real update-desktop-database exec (DELAYED)
23:10:24.223 backend ready (helper still delayed)
23:10:24.864 helper exited 0
23:10:24.882 registered URL scheme handler
xdg-mime query default x-scheme-handler/t3code => com.t3tools.T3Code.desktop
Codex gpt-6.1-sol completed a follow-up through the candidate web client and resumed the existing thread.
Remote Blacksmith: build:desktop passed; DesktopApp.test.ts 1/1 passed.
The packaged candidate completed a real Codex gpt-6.1-sol follow-up with two shell commands (pwd and git status --short), then rendered: packaged desktop provider path passed.

SHUTDOWN CANCELLATION
Real update-desktop-database suspended with strace's injected SIGSTOP, not replaced.
23:13:20.008 main window created
23:13:20.113 helper exec
23:13:20.116 helper stopped by SIGSTOP
23:13:21.256 closing the actual native window triggered before-quit
23:13:22.286 suspended helper killed by SIGKILL during scoped cancellation
Helper, application and backend processes exited; port 13773 closed.
An earlier cancellation attempt using strace delay_exit=30s triggered a strace dispatch_event error; that attempt is excluded from the result.

LIMITS
Locally assembled packaged Linux x86_64 runtime from the exact source builds, rather than the released AppImage installer.
No macOS, Windows, native iOS/Android, arm64, Wayland/portal integration or sandbox-enabled traced launch coverage.
No changes to the PR, no commits or pushes.