Toilal / rebulk / 28353819145

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refactor(chain)!: decouple Chain from Builder

Chain is now a plain Pattern; a new ChainBuilder (sharing a PatternFactory base with Builder) assembles it. Removes the circular import (deferred from .chain import Chain in build_chain), drops the Liskov type: ignore[override] on the chain fluent API, and makes the fluent chain fully typed end to end (.chain() -> ChainBuilder, .regex() -> ChainPart, ...). Matching engine unchanged; fluent building API identical at runtime.

BREAKING CHANGE: Chain is no longer a Builder subclass and Builder.chain() returns a ChainBuilder instead of a Chain. Code building chains via the documented fluent API is unaffected; only code relying on isinstance(chain, Builder) or annotating the .chain() result as Chain needs updating.

Closes #60

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