Replace the 11 hand-rolled model files with 7 grouped by concern. Typed
ID value classes kill bare-string FKs. Canonical 3-value MeasurementUnit
enum kills the runtime unitMismatch class — Polish vocabulary lives in
Quantity.displayHint as render-only metadata. MealExtras (5 maps) collapses
into IngredientCustomization + PlanCustomization. IngredientCategory and
MealSlot become household-scoped entities with LocalizedString names so
they're customizable without an app release. Display names land as
LocalizedString from day one; no Polish strings in identifiers or wire
codes. Recipe drops allowedSlots — slot affinity is a UI-layer match on
Recipe.tags vs MealSlot.name. Skip is absence, not a sealed sibling.
Plan: ~/.claude/plans/i-have-generated-some-inherited-conway.md.
Covered by SerializationRoundTripTest: 12 assertions across typed-ID
inlining, MeasurementUnit wire format, LocalizedString JSON shape, full
PlanEntry round-trip with every customization kind, SyncMeta tombstone
omission, and Catalog defaults handling. All targets compile and pass:
JVM, Android (debug + release), iOS Simulator Arm64.
