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- classify_path now Rejects a collection slug containing '.' (mirrors OrgCollections::validate, plan L317, and item_path's documented contract, plan L990). Unreachable today since git normalizes './' away, but keeps the pre-receive hook self-defensive against path traversal. - Rename test item_write_nested_slug_takes_leading_segment_only -> item_write_nested_slug_is_rejected (it asserts Rejected; old name misled). - Add dotted_slug_is_rejected covering the new guard. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01M5brcDrT35r5GaJySXD5ja