Fix/default stream singletons#1496

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Monishver11 wants to merge 6 commits intoNVIDIA:mainfrom

Monishver11:fix/default-stream-singletons

Commits on Jan 15, 2026

fix: Make legacy_default() and per_thread_default() return singletons - Fixes #1494
Monishver11
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fix to avoid the circular initialization issue
Monishver11
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