Anchor v2.2.1: selection-based parenting, transform fix, lockMovement, --up/--down

[KenanMillet]

Summary

Selection-based parenting, directional disambiguation, and a scale/flip transform fix.

v2.2.0 — Selection-Based Parenting

• First selected token = parent, rest = children (no ID required)
• --new flag: force auto-create invisible anchor (all selected = children)
• --persist: keep auto-created anchors when childless
• --up/--down modifiers for remove, lock, unlock, track, untrack, center
• Disambiguation required when token is both parent and child
• remove from parent unanchors all children
• --persist and --ignore-selected as preferred -- syntax (bare words still work)

v2.2.1 — Transform Fix + lockMovement

• Fix: child position offset now scales with parent size (proper TRS matrix transform)
• Fix: flip mirroring handled via negative scale in transform matrix
• Auto lockMovement when both left+top are tracked AND locked
• lockMovement cleared when conditions no longer hold (untrack, unlock, remove)
• State migration: old pixel offsets auto-normalized on first load (schemaVersion check)

Tested

• Selection-based anchoring (multi-select, single select, --new)
• Parent scale propagates to child offset distance
• Flip mirrors child position correctly
• remove/lock/unlock/track/untrack/center with --up/--down
• lockMovement set/cleared correctly
• State migration from v2.1.0

Breaking Changes

• Stored offsets are now anchor-size-relative (auto-migrated on first load)