Fix stdlib detection incorrectly flagging site-packages files#385

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Copilot wants to merge 9 commits intomainfrom

copilot/fix-skipping-notification-bug

Commits on Feb 18, 2026

Initial plan
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Fix stdlib detection to exclude site-packages and add tests

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edvilme
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Optimize is_stdlib_file to use string check instead of Path.parts

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edvilme
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Use path separators for more precise site-packages detection and add false positive test

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Handle edge cases: root-level site-packages and cross-platform paths in tests

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edvilme
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Remove unnecessary startswith check and improve false positive test

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edvilme
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Improve tests to validate path segment matching logic

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edvilme
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Remove duplicate import and add edge case check for root-level packages

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edvilme
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Remove redundant condition and improve test validation

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edvilme
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