pr #30154 runtime verification, linux boat vm
main: cefb544af3c98224874419198c0359b652ca3c94
pr before follow-up: 15be9a5d8d469c59c239d4ec5cda59e8364b89b9
verified follow-up: 45d2c0972e20da7e656d75f0ff3d681a79808371

$ git worktree add ../main github/main
$ (cd ../main && timeout 600 vp i)
$ setsid nohup timeout 6500 vp run dev > /tmp/main-dev.log 2>&1 &
[dev-runner] serverPort=16733 webPort=8693 baseDir=/home/user/main/.t3
playwright from repo dependencies, executable /usr/bin/google-chrome
created real /home/user/t3code project through add project/local folder.
submitted real Codex gpt-6.1-sol turn and received assistant response.
added unavailable custom model through provider settings and selected it for text generation.
thread breadcrumb menu -> regenerate title
[15:51:26.103] WARN: Thread title generation failed
Codex CLI final error: {"error":{"code":"model_not_found","message":"unknown provider for model gpt-nonexistent-title-verification","param":"model","type":"invalid_request_error"}}
main result: spinner cleared, title unchanged, no error notification.

stopped main by captured process group; copied only this task's app-created dev state.
$ vp i
$ setsid nohup timeout 6000 vp run dev --home-dir /home/user/t3code/.t3 > /tmp/dev.log 2>&1 &
[dev-runner] serverPort=13773 webPort=5733 baseDir=/home/user/t3code/.t3
original PR result: toast showed Codex banner/echoed prompt, but not model_not_found.
follow-up: preserve final Codex ERROR line before existing failure message cap.
regression test failed before fix and passed after it on blacksmith.
restarted dev server in background with same isolated app-created state.
thread breadcrumb menu -> regenerate title: toast includes model_not_found and unknown provider for model.
sidebar context menu -> regenerate title: same real error shown.
ctrl-select two real threads -> regenerate titles (2): two independently titled failure toasts.
second real Codex gpt-6.1-sol turn completed while initial title generation failed: fallback title remained; no regeneration failure toast.
restored text generation to gpt-6.1-sol in settings.
rename thread -> manual verification title: saved.
regenerate title -> show title regeneration errors: success, zero error toasts.
reload -> show title regeneration errors: persisted.

$ blacksmith-check run --id <task-owned-worker> 'vp run check:changed'
pass format, lint, knip (2), graphql, typecheck (36 affected packages), tests (19 files, 368 tests), react compiler; 10 cross-file tests also passed.

not exercised: native iOS/Android client, Electron shell integration, macOS/Windows, other providers, remote relay/tunnel/multiple environments, expired OAuth specifically.