plan: 0070 streaming sink reductions
Eight-task plan for the M3 fix: SeriesFold + Node::finalize (aura-core), Harness::run finalize epilogue + summarize refactor (aura-engine), GatedRecorder + SeriesReducer folding sinks (aura-std), stage1_r_graph reduce-mode rewiring (aura-cli), with byte-identity (equivalence) and O(trades) (memory) integration tests. refs #138
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