[embind] Add pointer policies for val's call, operator(), and new_.#24832

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brendandahl wants to merge 2 commits intoemscripten-core:mainfrom

brendandahl:embind-call-policy

Commits on Jul 31, 2025

Move policy code into wire.h so it can be shared with val.h and bind.h.
brendandahl
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[embind] Add pointer policies for val's `call`, `operator()`, and `new_`.
brendandahl
committed