PR: https://git.cafe/pingdotgg/t3code/pulls/21448
head: 123cc584c0fff85723f0f5884068ffcde11f4927
baseline: github/main e5909e53c3
Linux; Node v24.22.1; repo Playwright 1.60.0; /usr/bin/google-chrome

Installed each checkout with timeout 600 vp i.
Started each dev server in background with setsid nohup and a 6500-second timeout.
Main: server 16733, web 8693, isolated /home/user/main/.t3.
PR: server 13773, web 5733, isolated /home/user/t3code/.t3.
Stopped main by captured process group before running the PR.
Created project and threads through web UI, pointing at a real git repository.
No mocks, replay providers, fixtures, or seeded databases used.

Real Codex gpt-6.1-sol turn, both branches:
prompt: Read open.txt and secret.txt using tools, then report their contents. Do not modify any files.
main stored command_execution completed, output: ok / private verification text.
PR stored command_execution completed, output: ok / private verification text.
PR web reload preserved the thread, assistant answer, and tool history.

Real Codex follow-up on PR:
prompt: Use a shell tool to read missing.txt (it does not exist), then read open.txt. Report the failure and the successful content. Do not create or modify any files.
UI: missing read shows exit 1; successful sibling shows ok.
Read-only SQLite projection query:
command_execution | failed    | cat: missing.txt: No such file or directory
command_execution | completed | ok
checkpoint        | completed |
Verification repo git status --short: empty.

Cursor availability:
timeout 30 cursor-agent status => Not logged in
CURSOR_API_KEY: absent (presence check only)
Added Cursor through Settings > Providers on both branches.
Main showed Checking Cursor SDK availability, 0 models, Sign in.
PR showed Not authenticated: Sign in with Cursor or add CURSOR_API_KEY in provider settings; 0 models.
No Cursor run could be started. Original bug and changed Cursor finalization path remain UNVERIFIED.
Codex uses a different adapter and is only neighboring integration coverage.

Blacksmith: existing Cursor adapter test file, 21 passed.