Patchwork 0.6.2

• Split Patchwork state planning into dedicated edit, apply, cleanup, and undo
  planner components while keeping command execution behavior stable.
• Made explicit patchwork apply <pkg> validate committed patch content before
  materializing generated output, matching apply-all validation.
• Tightened artifact identity parsing and kept carry override-conflict hints
  tied to the actual patchwork carry command.