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Commit 533f3299 dropped the static tag counter from
generateAllreduceContextKey, causing every non-symmetric call to
return the same key (zero) and reuse a stale context. Restore the
pre-MNNVL behavior of returning a unique key per non-symmetric call
so the context cache rebuilds when buffers change.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>