v8.0.0-rc.9-dev.4: feat(psl): expose inspectable attribute combinators (#30247)

发生了什么

Expose inspectable attribute combinators so tooling can consume the same grammar used by PSL interpretation, without maintaining a second descriptor tree. Changes Parser API: replace open argument kinds with a closed discriminated union exposing fixed values, collection children, union alternatives, and function signatures. Optional wrappers preserve metadata and output types. Context safety: distinguish local and r…

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