philihp / pcg / 26158924986

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Move createPcg factory into index (#339)

* refactor: move createPcg factory into index

Hoists the createPcg / createPcg32 factory (and the MASK_64 constant
used only here) out of pcg32.ts and into index.ts, alongside the
already-exported createMulberry32 path. pcg32.ts now exposes only the
pcg32 algorithm (pcg32Advance, pcg32Output) and resolveStreamScheme,
matching the structure of mulberry32.ts.

* refactor: make createPcg32 the canonical factory

Swaps the alias direction: createPcg32 now holds the full factory
implementation and createPcg is the thin alias. The variant-suffixed
name aligns with createMulberry32 and leaves room to add a
createPcg64 later, so createPcg becomes the form that will eventually
be deprecated.

* refactor: keep createPcg32 in pcg32.ts for variant symmetry

Moves createPcg32 (and the MASK_64 constant + resolveStreamScheme
helper it uses) back into pcg32.ts so each variant module owns its
own create<Variant> factory, mirroring mulberry32.ts. index.ts now
just re-exports createPcg32 and defines the createPcg legacy alias.

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Co-authored-by: Claude <noreply@anthropic.com>

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