Groundwork for the Library tab: RoutineOrdering.changedOrders turns an
.onMove gesture into the minimal set of order writes (normalizing legacy
colliding orders on first drag), RoutineNaming.uniqueName picks the next
free "X Copy" name for duplication, and ExerciseCatalog groups the bundled
exercise library into curated category sections with name/category/target
search. Plus ExerciseDocument.planSummary for read-only document rendering.
All covered by unit tests, including a motion/info name-parity assertion.
Claude-Session: https://claude.ai/code/session_01H8VxUX4ckjU3vRF5M4L5FV
