⚡ Bolt: Optimize readability checks in ATSGenerator

[anchapin]

💡 What: Hoisted action verbs to a module-level tuple _ACTION_VERBS, extracted all_text.lower() to execute outside the generator expression loop, and pre-compiled regex patterns _QUANTIFIABLE_PATTERN and _ACRONYM_PATTERN at the module level in cli/generators/ats_generator.py.
🎯 Why: Inside the _check_readability function, all_text.lower() was evaluated redundantly for every verb in the list, causing N unnecessary string allocations per check. Furthermore, list instantiation and regex recompilation occurred on every invocation.
📊 Impact: Expected to reduce string allocation overhead and speed up ATS generation evaluation significantly.
🔬 Measurement: Verify by executing python -m pytest tests/test_ats_generator.py and reviewing code execution speed directly.

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PR created automatically by Jules for task 12620931963254118574 started by @anchapin

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