[Bug]: Continue threads after restarts does not preserve Codex reasoning effort

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/server

Steps to reproduce

1. Enable "Continue threads after restarts".
2. Open a Codex thread and explicitly select a non-medium reasoning effort, such as High.
3. Start a task and restart T3 Code while the turn is still running, without manually stopping the thread first.
4. Let the thread continue automatically. Do not change the model or reasoning settings, and do not send a manual follow-up.
5. Compare the reasoning effort of the automatic continuation with the setting used before the restart.

Expected behavior

The automatically continued turn should preserve the reasoning effort used before the restart. Restarting T3 Code should not change this setting.

Actual behavior

The thread continues automatically, but the reasoning effort differs from the setting used before the restart, without any manual change.

Source inspection of v0.0.40 suggests a possible cause:

• In apps/server/src/serverRuntimeStartup.ts, restart reconciliation calls providerService.sendTurn without modelSelection.
• CodexAdapter reads reasoningEffort from the current turn's modelSelection.
• In apps/server/src/provider/Layers/CodexSessionRuntime.ts, buildCodexCollaborationMode falls back to medium when effort is missing.

Impact

Minor bug or occasional failure

Version or commit

v0.0.40

Environment

No response

Logs or stack traces

Screenshots, recordings, or supporting files

No response

Workaround

No response

Start with apps/server/src/serverRuntimeStartup.ts and trace the restart reconciliation call into apps/server/src/provider/Layers/CodexSessionRuntime.ts and the CodexAdapter. Reproduce the v0.0.40 scenario with a non-medium reasoning effort and automatic continuation after a restart. Done means the continued turn preserves the effort selected before the restart, with coverage for this case.