⚡ Bolt: parallelize unit test execution in gate script

[heidi-dang]

💡 What:

• Implemented ThreadPoolExecutor in scripts/03_unit_test_gate.py to parallelize the execution of generated code samples.
• Fixed a bug in save_jsonl that caused FileNotFoundError when the output path was in the current directory.
• Fixed a pre-existing NameError in heidi_engine/telemetry.py:get_state that was discovered during full test suite execution.

🎯 Why:

• Sequential execution of subprocess.run for each code sample was a significant bottleneck in the training pipeline, especially as the dataset size grows.
• The os.makedirs bug prevented running scripts with output in the current directory.
• The NameError in telemetry broke state retrieval on cache misses.

📊 Impact:

• Measurable speedup of ~2.2x on 100 samples with 4 workers (from ~2.5s to ~1.1s).
• Improved pipeline reliability by fixing pre-existing bugs.

🔬 Measurement:

• Run python3 scripts/03_unit_test_gate.py with a large JSONL input and observe the "Running with N parallel workers" log and reduced execution time.
• Verify that pytest tests/ now passes (previously failing due to NameError).

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PR created automatically by Jules for task 1317338254387165136 started by @heidi-dang

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[gemini-code-assist]

Code Review

This pull request parallelizes unit test execution in scripts/03_unit_test_gate.py using a ThreadPoolExecutor to run tests concurrently while preserving their original order. It also updates save_jsonl to handle current-directory paths gracefully and removes an unused state cache check in heidi_engine/telemetry.py. Additionally, a documentation entry is added to .jules/bolt.md summarizing these optimization learnings. There are no review comments, so I have no feedback to provide.

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