Toilal / rebulk / 28263217148

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feat(typing): typed value retrieval — Key[T] and Matches.to (v5 POC)

Add type-safe value retrieval on top of the dynamic engine (purely additive; match.value stays Any by default):

- Key[T]: a typed handle binding a match name to its value type. Passing it via key= wires up name+formatter; matches[KEY] -> T | None, matches.all(KEY) -> list[T].
- Matches.to(model) projects named matches onto a typed model:
  - dataclass / TypedDict (field by name; list[...] field collects all, scalar takes first),
  - a primitive type (first value),
  - list[<scalar>] (all values); list of dataclass/TypedDict is rejected (no record grouping).

mypy --strict clean, 179 tests passing under both the re and regex backends, README documented.

Refs #43

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