Toilal / rebulk / 28351801501

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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. This removes the circular import that forced
a 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, ...).
The matching engine is unchanged; the fluent building API
(rebulk.chain().regex(...).repeater(...).close()) is 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

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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