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Add mulberry32 as another variant (#338)

* feat: add mulberry32 as another variant

Adds a small 32-bit counter-based PRNG (Tommy Ettinger's mulberry32) as an
additional variant alongside pcg32. State is tagged via the existing
PCGVariant field and plugs into the same nextState, getOutput, randomInt,
randomList, and stepState functions.

* revert README changes from this branch

* refactor: split pcg32 algorithm into its own module

Renames createPcg.ts to pcg32.ts so it mirrors the structure of
mulberry32.ts: each module exports `<variant>Advance(pcg, delta)`,
`<variant>Output(pcg)`, and a `create<Variant>` factory. The variant-
dispatched `nextState`, `getOutput`, `stepState`, `prevState`, and the
generic `randomInt` / `randomList` utilities now live in index.ts.

* refactor: dispatch variants through a registry table

Replaces the if/else ternary in advance and output with a
Record<PCGVariant, VariantImpl> table. Adding a new variant now means
adding one row to VARIANTS rather than editing two dispatch sites.

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

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