Standalone script that moves memories between graphs based on tag
matching. Handles memory files, edges, index/embedding/state metadata,
cross-graph edge cleanup, and overlap detection (copy to multiple
graphs). Supports dry-run, idempotent re-runs, and git auto-commit.
Closes: #4, #5, #6
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
