Adopt idiomatic Effect APIs in generator and decider (#2581)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Julius Marminge <juliusmarminge@users.noreply.github.com>
Co-authored-by: Julius Marminge <julius0216@outlook.com>
1bcfc88f58cursor[bot] committed on 5/7/2026, 7:19:32 PM· committed by GitHubparent2ba5807
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