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types: round out public typings; re-affirm #240 (#320)

* types: complete public typings and re-affirm #240 fix

- randomList: was fully untyped (length/rng/initPcg = any) — now generic
  in T with a manually-declared curried overload set so partial application
  preserves the element type through to [T, PCGState][]
- Introduce and export RandomFn<T>, LongLike, CreatePcg, CreatePcgOptions
  so consumers can name them
- Use the new types in createPcg.ts's default export instead of inline literals

Verified the original issue scenario:
  const fn = () => createPcg32({}, 42, 54)
  // before: () => any (or non-portable Curry<...>)
  // after:  () => PCGState

And generic flow:
  const u32: RandomFn<number> = randomInt(0, 2 ** 32 - 1)
  randomList(10, u32, pcg)  // [number, PCGState][]

* refactor: move public types to types.ts, drop redundant overload

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

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