Toilal / rebulk / 28337140445

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refactor(chain): type ChainPart fluent methods instead of Any

ChainPart.regex/string/functional now return ChainPart and chain() returns
Chain, replacing -> Any. The three delegating methods cast the result
because the underlying Builder.regex/string/functional are typed -> Self
while Chain.pattern() actually yields a ChainPart (the existing Liskov
quirk, left for the v5 Chain/Builder decoupling). Typing-only, no runtime
change.

Refs #43

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

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