[Bug]: uv run oh crashes with TypeError (unexpected keyword argument 'permission_mode')

[damoon50]

What happened?

When I run uv run oh, the CLI shows Connecting to backend... and then exits with a traceback.
Actual behavior:

• Backend exits with code 1
• Error: TypeError: run_backend_host() got an unexpected keyword argument 'permission_mode'
  Expected behavior:
• uv run oh should start the interactive TUI normally.

Steps to reproduce

1. Clone the repository and enter project directory:

   git clone https://github.com/HKUDS/OpenHarness.git
   cd OpenHarness

2. Install dependencies:
   uv sync --extra dev
3. Run interactive mode:
   uv run oh
4. Observe crash after Connecting to backend... with TypeError.

Expected behavior
uv run oh should launch the interactive TUI session.
Actual behavior
Backend exits with code 1 because run_backend_host() does not accept permission_mode.
Root cause
run_repl() forwards permission_mode to run_backend_host(...), but:

• run_backend_host function signature does not include permission_mode
• BackendHostConfig does not include permission_mode
• the value is not passed through to build_runtime(...)
  Proposed fix
  Propagate permission_mode end-to-end in backend host:
• Add permission_mode: str | None = None to BackendHostConfig
• Add permission_mode parameter to run_backend_host(...)
• Pass permission_mode=self._config.permission_mode into build_runtime(...) in ReactBackendHost.run()
  Verification after patch
• uv run oh --backend-only no longer throws TypeError
• uv run oh no longer fails from this argument mismatch

Environment

• OS: Windows 11
• Shell: PowerShell ((base) conda environment)
• Python: Anaconda Python (traceback path shows D:\anaconda\Lib\asyncio\...)
• Install method: from source (uv sync --extra dev, then uv run oh)
• Provider profile at runtime: minimax (but issue appears before any model response, likely provider-independent)
• Base URL in active profile: https://api.minimax.chat/v1

Relevant logs or screenshots

(base) PS E:\ASUS\Github\OpenHarness> uv run oh
Connecting to backend...
Traceback (most recent call last):
  File "E:\ASUS\Github\OpenHarness\src\openharness\cli.py", line 1432, in main
    asyncio.run(...)
  File "D:\anaconda\Lib\asyncio\runners.py", line 194, in run
    return runner.run(main)
  File "D:\anaconda\Lib\asyncio\runners.py", line 118, in run
    return self._loop.run_until_complete(task)
  File "D:\anaconda\Lib\asyncio\base_events.py", line 687, in run_until_complete
    return future.result()
  File "E:\ASUS\Github\OpenHarness\src\openharness\ui\app.py", line 33, in run_repl
    await run_backend_host(...)
TypeError: run_backend_host() got an unexpected keyword argument 'permission_mode'
ℹ backend exited with code 1

[tjb-tech]

I just tried to reproduce this on the current main using:\n\nbash\nuv run oh --permission-mode acceptEdits --print "Reply with exactly OK"\n\n\nand it completed successfully, so this does not look reproducible on the latest main from my side.\n\nThis makes it more likely that your local environment is still picking up an older installed copy / stale build, where the backend host signature is out of sync with the current CLI path.\n\nCould you please re-fetch / reinstall the latest version and try again? For example, re-pull the latest main and rerun from the repo, or re-run your install/bootstrap flow (curl/install script) so you are on the newest code. If it still reproduces after that, please paste the full traceback plus the exact install/update steps you used.

[tjb-tech]

This is already fixed on main.

The permission_mode backend startup regression was addressed earlier, and current backend/TUI regression coverage is passing.

Validation re-run locally:

• PYTHONPATH=src uv run pytest -q tests/test_ui/test_react_backend.py
• included again in the broader focused regression run (52 passed for tests/test_engine/test_query_engine.py tests/test_ui/test_react_backend.py tests/test_commands/test_registry.py)