[BUG] Self-hosted runner: resumed session comes back in plan mode although the session wrapper passes --permission-mode auto

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Code

What's Wrong?

On a self-hosted environment (claude self-hosted-runner), a session that is released (idle release) and later resumes on a fresh runner comes back in plan mode. The user had not asked for plan mode, and the session had left plan mode before it was released.

The runner's --exec-path wrapper appends --permission-mode auto to every session it starts:

exec "$CLAUDE_RUNNER_CLAUDE_BIN" "$@" --permission-mode auto

so the expected mode on every resume is auto. Observed over one session with four resumes:

| Resume | Mode on resume |
|---|---|
| 1 | plan (re-enabled) |
| 2 | not in plan mode |
| 3 | plan (re-enabled) |
| 4 | not in plan mode |

Each plan-mode resume needed an ExitPlanMode round trip and user re-approval before work could continue.

This looks related to the 2.1.132 change that re-applies plan mode when resuming a plan-mode session (see #56883). If the restored mode is taken from an earlier point in the transcript, it overrides both the session's current mode and the wrapper's explicit flag.

What Should Happen?

A resumed session keeps the permission mode it had when it was released. An explicit --permission-mode passed by the runner's wrapper is not silently overridden.

Error Messages/Logs

No error. The resume turn shows plan mode active.

Steps to Reproduce

1. Run claude self-hosted-runner with --release-idle-session-min 10 and an --exec-path wrapper that appends --permission-mode auto.
2. Start a session, enter plan mode, have the plan approved (ExitPlanMode), and continue working in auto mode.
3. Leave the session idle past the release timeout.
4. Send a message so it resumes on a fresh runner.
5. The session is in plan mode again.

Claude Model

Opus

Is this a regression?

I don't know

Claude Code Version

2.1.294 (runner image built from the latest apt channel)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

The runner runs one session per Kubernetes pod with a fresh --base-dir per pod, so nothing local carries over between resumes. A related report covers the pending ExitPlanMode approval being orphaned when the session is released while waiting on it.