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Preference memory fixes (#2337)

* fix: preserve fast memories when async fine extraction fails

* fix: filter polluted sources before preference extraction

* fix: refine preference extraction prompts
Q
Qi Weng committed
cc244f442b5b3ddd0619d9c758d184996ae496af
Committed by GitHub <noreply@github.com> on 9/3/2026, 6:26:41 AM