fix(agbench): close console_log.txt file handle in run_scenario_in_docker

[Ricardo-M-L]

Why

run_scenario_in_docker (in agbench/run_cmd.py) opens console_log.txt with a bare open() and never closes it:

log_file = open(os.path.join(work_dir, "console_log.txt"), "wt", encoding="utf-8")
...
# function returns / sys.exit(1) — log_file.close() is never called

This function is called once per scenario and per repetition during a benchmark run (run_scenario_in_docker is invoked inside the per-instance / per-repetition loop). The leaked write handles therefore accumulate over the course of a run. On large benchmark suites this can exhaust the process file-descriptor limit, and on Windows the unclosed handle keeps console_log.txt locked.

Note the sibling handle in the same module (file_handle in run_scenario) is closed explicitly — this one was simply missed.

Fix

Wrap the streaming / log-writing block in a with statement so the handle is always released:

• on the normal StopIteration path,
• when the Docker timeout path returns,
• and when exiting via sys.exit(1) after a KeyboardInterrupt (the finally from the context manager runs before the process exits).

No behavior changes other than guaranteed handle release. The if exiting: sys.exit(1) check is intentionally kept outside the with block so the file is flushed and closed before the process exits.

Verification

• python -m py_compile passes.
• AST check confirms the log-writing block (including the if stopping: epilogue) is now nested under the with open(...) as log_file: context manager.

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[avinashkamat48]

The file handle is now closed by the context manager, but the PR does not add a regression test around the timeout/KeyboardInterrupt paths that write to console_log.txt after the log loop exits. Those are the paths most likely to regress with this indentation change. Could you add a small unit test or mocked container case proving the timeout footer is written and the file is closed after run_scenario_in_docker exits?

[Ricardo-M-L]

Hi @ekzhu @jackgerrits! This PR fixes a file handle leak in run_scenario_in_docker where console_log.txt is never explicitly closed, leading to resource exhaustion during long benchmark runs.

Please let me know if you'd like me to add tests, adjust the approach, or rebase onto the latest main. Thanks!