Fix persist_mut push-side borrow conflict; remove Stratum#2849

Draft

MingweiSamuel wants to merge 12 commits intomainfrom

mingwei/dfir-push-ops

Commits on May 6, 2026

feat(dfir_pipes): add push-side `Fold`, `Reduce`, and `Sort` operators

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refactor: remove is_first_run_this_tick() — always true in inline DAG mode

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Fix inaccurate doc comment on Context struct

MingweiSamuel
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Add push-side fold codegen and restore Stratum for persist_mut

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Add push-side codegen for sort and reduce operators

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Add push-side codegen for fold_keyed, fix FoldKeyed type generics

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Add push-side codegen for reduce_keyed

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Add push-side codegen for reduce_keyed; persist_mut stays pull-only

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Investigate persist_mut push-side borrow conflict

MingweiSamuel
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Fix persist_mut push-side borrow conflict; remove Stratum

MingweiSamuel
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Keep persist_mut and persist_mut_keyed with Stratum (need emit-on-flush)

MingweiSamuel
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Remove Stratum from persist_mut and persist_mut_keyed

MingweiSamuel
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