reference is the read-only diff lens with an agent-readable framing line. Pure-JS
unified-diff producer + parser + applier (no patch(1) dependency). Two-way merge
with documented limitation: without scaffold-time base tracking, applied hunks
align everything to gbrain. The agent dry-runs reference first, then decides.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
