e54441eaa2
- Added a `= A..B` hashline rule and adjacent-edge guidance to the tool prompt. - Added `HashlineReplacementGroup` and `HashlineDeleteEdit` with helpers to find anchor-target lines. - Added `findReplacementGroup()` and duplicate-boundary absorption to normalize edits with synthetic deletes and warnings. - Added normalization flow into `applyHashlineEdits` before bucketing, and added duplicate-boundary edge-case tests. - Updated `CHANGELOG.md` with Added and Fixed unreleased notes for hashline boundary-line behavior.