[wip] shared memory optimization for policy weight update

[casteryh]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 89.04110% with 48 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@399b20d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/forge/actors/policy.py	2.94%	33 Missing ⚠️
tests/unit_tests/util/test_shared_tensor.py	97.02%	9 Missing ⚠️
src/forge/util/_shared_tensor.py	94.05%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #402   +/-   ##
=======================================
  Coverage        ?   66.06%           
=======================================
  Files           ?       81           
  Lines           ?     8127           
  Branches        ?        0           
=======================================
  Hits            ?     5369           
  Misses          ?     2758           
  Partials        ?        0           

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