Fix hybrid loop detector detection method

[matdev83]

Summary

• ensure HybridLoopDetector classifies detection_method using the configured short detector chunk size
• add a regression test that exercises short pattern detection and verifies the reported method

Testing

• python -m pytest --override-ini addopts="" tests/unit/loop_detection/test_hybrid_loop_result_details.py
• python -m pytest --override-ini addopts=""

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https://chatgpt.com/codex/tasks/task_e_68e6e2f655fc83339e3e4b89a878f07f

[matdev83]

✅ APPROVED - This PR correctly fixes the HybridLoopDetector bug where detection_method was using a hardcoded threshold (500) instead of the configured short_detector.content_chunk_size. The fix is clean, well-tested with a comprehensive regression test, and all relevant tests pass. Safe to merge.