Add AssuranceTypeMapper for IDE-readable type narrowing#2
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Generate IDE-readable narrowing PHPDoc from a node's #[Assurance] / fluent mixins narrow types after assert()/check() without a PHPStan extension. - New AssuranceTypeMapper maps each assurance shape to a Chain<T> generic: concrete types, the argument-derived forms (from: Value -> @param T; from: TypeString -> @param class-string<T>), element forms, Container subjects, and the Wrap/Container/Elements prefix compositions (with union de-duplication). #[AssuranceParameter] selects which argument carries the type (any position, default first) -- it no longer implies class-string; `from` decides the derivation. Argument-wrapping forms stay Chain<mixed> to avoid retyping Validator parameters to Chain<T> (which would reject raw, non-fluent validators). - New NarrowingDoc and TerminalMethod value objects; InterfaceConfig gains emitNarrowing / chainType / templateParam / terminalMethods, threaded through MethodBuilder and MixinGenerator. - Unit coverage per bucket plus a MixinGenerator narrowing integration test.
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Part of a PR group: Fluent - FluentGen - Validation
Generate IDE-readable narrowing PHPDoc from a node's #[Assurance] / fluent mixins narrow types after assert()/check() without a PHPStan extension.