linux runtime verification: pr 25210
main: 9c6429d74b59c7a06fb7357526457d192a744a9f
pr: da7ba84cd60db3a3140248371db6402d16dec3d1

method: locally assembled packaged Electron runtime with the repository's unmodified desktop/server bundles and Vite renderer. isolated T3/XDG state. real /usr/bin/update-desktop-database suspended at exec through ptrace; no replacement helper, mocked spawner, or synthetic project data.

main startup log
1793164978.594 ROOT pid=28530
[05:23:00.250] INFO (#1): app ready
1793164980.267 EXEC pid=28625 exe=/usr/bin/update-desktop-database
1793164980.267 PAUSED_HELPER pid=28625 executable=/usr/bin/update-desktop-database signal=SIGSTOP

main observation at 2026-10-28 05:23:09 UTC, more than 9s after helper exec:
/proc/28625/status: State T (stopped), TracerPid 0, ShdPnd 0000000000004000 (SIGTERM pending).
GET http://127.0.0.1:9223/json/list => []
ss -H -ltnp sport = :16733 => no listener
no registration or bootstrap log before manual cleanup.

pr stalled-helper startup log
1793166354.678 EXEC pid=45893 exe=/usr/bin/update-desktop-database
1793166354.678 PAUSED_HELPER pid=45893 executable=/usr/bin/update-desktop-database signal=SIGSTOP
[05:46:00.673] WARN (#1): desktop MIME cache refresh failed
[05:46:00.824] INFO (#1): registered URL scheme handler
[05:46:00.825] INFO (#1): bootstrap start
[05:46:00.895] INFO (#1): bootstrap backend start requested
[05:46:02.232] INFO (#6478): Listening on http://127.0.0.1:13773

/proc/45893/status was absent after timeout cleanup.
pr ordinary restart log (no instrumentation)
[05:49:37.752] INFO (#1): registered URL scheme handler
[05:49:37.753] INFO (#1): bootstrap start
[05:49:37.774] INFO (#1): bootstrap backend start requested
[05:49:38.723] INFO (#6494): Listening on http://127.0.0.1:13773

xdg-mime query default x-scheme-handler/t3code-dev
com.t3tools.T3Code.Development.desktop

actual generated mimeinfo.cache:
[MIME Cache]
x-scheme-handler/t3code-dev=com.t3tools.T3Code.Development.desktop;

actual generated mimeapps.list:
[Default Applications]
x-scheme-handler/t3code-dev=com.t3tools.T3Code.Development.desktop

[Added Associations]

real client/provider path: added /home/user/main as a project through the desktop folder picker, selected Codex GPT-6.1-Sol, submitted git inspection commands and observed completed response. restarted desktop normally, reopened saved thread from sidebar, and submitted a successful follow-up.

checks: 15 DesktopLinuxUrlHandler tests passed on Blacksmith. check:changed against original PR base b16728af846ab00903867737f80bbd4d75cf973d passed format, lint, both knip passes, desktop/scripts typechecks and adjacent tests.

limits: local unpacked assembly, not distributed AppImage or installer. development protocol t3code-dev exercised; production t3code scheme, external shell activation, macOS, Windows, native iOS/Android, remote/relay/tunnel modes not exercised. initial server dev bundling exceeded 10 minutes on this VM; runtime startup itself completed once artifacts were available.