Range move (drag‑move)

Range‑move transfers a block of cells to a new location.

1) Minimal contract

• Explicit drag‑move start (separate handle or modifier).
• Smooth target range updates.
• Escape cancel and safe rollback.

2) Basic sequence

orchestration.move.begin({ rowIndex: 1, colKey: "owner" })
orchestration.move.update({ rowIndex: 5, colKey: "owner" })
orchestration.move.commit()

3) UI recommendations

• Show a placeholder at the drop target.
• Do not mix drag‑move and fill‑handle.
• Consider virtualization on drag over.