contract_patch_has_substantive_change walked git diff --unified=1000
output and tracked the last ## header seen in the patch, so an edit
more than 1000 lines below its section header (e.g. deep inside
unified-resources.md's Current State) lost its section and was wrongly
reported as not substantive, forcing a contract-neutral bypass on
74131e56e.
Replace the patch walk with full-file attribution: diff the HEAD blob
against the staged blob and map every changed line to its section via
a per-line section map built from the complete file. Covers new
contract files (empty HEAD blob) and keeps metadata-only edits
non-substantive. Adds regression tests for edits >1000 lines below
their section header in both directions.
rcourtman
b05d255576