Defame1297
2c731eb476
Its sibling sync-plugin-content.sh has thorough coverage (tests/test-sync-plugin-content.sh) but this drift guard -- wired into pre-commit as check-marketplace-mirror-sync, keeping .claude-plugin/marketplace.json and .github/plugin/marketplace.json in sync -- had none. A silent regression here would let the two marketplace manifests drift without any test catching it. Covers: missing-source no-op in both real-sync and --check modes, drift detection when the mirror is missing or stale, real sync producing a byte-identical mirror, --check clean immediately after sync, drift from an edited source cleared by re-sync, an already-in-sync mirror reporting no drift, usage-error rejection of unrecognized/extra arguments, and idempotency of repeated syncs.