- Added merge_test.go with 797 lines of test coverage - Tests for field merging, dependency merging, timestamp handling - Tests for deletion detection and conflict generation - Integration tests for merge driver auto-config in bd init - Test helpers for git repository setup Closes bd-kazt All tests pass: go test ./internal/merge/... -v Amp-Thread-ID: https://ampcode.com/threads/T-f0fe7c4c-13e7-486b-b073-fc64b81eeb4b Co-authored-by: Amp <amp@ampcode.com>