futpib / goal / 23503598357

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Add priority ranking system with cycle-safe DAG ordering

- New commands: `goal rank <higher> <lower>` and `goal unrank <higher> <lower>`
  assert/remove pairwise "more important than" relations between any goals
- Cycle detection via recursive CTE reachability check; transitive cycles rejected
- `goal list` now excludes achieved goals and sorts siblings by priority rank
- Ordering: Kahn's topological sort with tie-breaking (linked > unlinked, newer > older)
- Reparenting migrates priority edges to new IDs automatically
- Deleting a relay goal (A > B > C, delete B) synthesizes transitive edge A > C
- Undo of delete restores original edges and removes synthetic ones
- All rank/unrank operations are undoable via existing event system

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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