Document all function declarations across the repo#23

Draft

Copilot wants to merge 11 commits intomainfrom

copilot/update-function-comments

Commits on Feb 13, 2026

Initial plan
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Plan: add function comments

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Add function comments

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Refine function comments

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Polish ingest comment

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Finalize CSV comment

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Adjust comment wording

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Fix CSV file check

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Use imperative comments

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Clarify function comments

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Restore CSV substring check

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