gsd-import

• --from: Import an external plan file, detect conflicts, write as GSD PLAN.md, validate via gsd-plan-checker.
• --from-gsd2: Reverse-migrate a GSD-2 project (.gsd/ directory) back to GSD v1 (.planning/) format. Runs gsd_run from-gsd2. Pass --path <dir> to migrate a project at a different path.

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