When src/uix/lib/types.ts went down with the rest of src/uix/lib/ in
phase A of the cleanup, the Layer and PartRef cross-layer primitives
went with it. Three files still imported them via `'../lib/types'`:
- src/uix/sema/types.ts
- src/uix/morfo/types.ts
- src/uix/morfo/compile.ts
Move the two types to src/uix/types.ts (top-level shared, sibling to
all UIX layers — no layer "owns" a cross-layer primitive), translate
the doc comment to English, and update the three importers to
`'../types'`. No semantic change.
Verified: svelte-check went from 49 errors to 46 (the 3 caused by the
deletion are gone); the remaining 46 are pre-existing and unrelated.
Vitest: morfo + eidos + sema = 136/136 green.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
