trunk/cc22f884a1fd14a94ce3cead4f2a13e1603ee2d1: Document symmetric memory operator maturity (#200336)

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Audit the symmetric-memory operator surface, separating module-level Alpha maturity from hardware and backend scope while identifying especially experimental and internal interfaces. Add reference documentation for the fused collective-matmul operators, remote tensor views, and previously omitted Python wrappers, with portability, autograd, and stream-ordering caveats. Test Plan: lintrunner -a spin quicklint Both li…

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