feat(planner): compose exact operators with summary plans - #314
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…ase boundaries (#171) Add phase-explicit post-ASAP nodes SummaryExpr::{ExactTransform, ExactPostProcess} carrying a non-exhaustive ExactOperator::Aggregate payload (never an intact QueryExpr subtree), plus an ExecutionAvailability {UpdateValue, SummaryState, ReadoutValue} derivation/validation (post_asap::phase) returning typed PhaseErrors at construction. construct_summary_agg now validates its edge, so a maintained summary over a query-time readout falls back conservatively instead of producing an unexecutable plan. Add ExactCompositionStrategy (registered in default_strategies) proposing Replacement::ExactComposition candidates that reference the child target rather than selecting a child; PlanSpace::global_selection commits the compatible parent/child pair using the issue's cost-units-per-second formulas (postprocess/pretransform vs raw-recompute baseline), counts shared child state once, and GlobalSelection::materialize links the committed decisions into one validated DAG with shared Rc identity. Cost hooks: CostModel::mixed_execution_capabilities and exact_composition_cost_inputs (unknowns stay None, never zero; missing statistics keep KeepPreAsap). DAG export gains explicit per-node stage, decision provenance, cost unit and child-decision links (additive). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Stacked on #300. Adds the exact-composition strategy, accuracy propagation, recurring cost hooks, parent/child memo commitments, materialization, and decision/DAG explanations. E2E coverage is intentionally split into the next PR.