Level-3: native dataflow graphs (CFG/PDG/SDG/CPG) and backward slicing#68

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feat/level3-dataflow-sdg

Commits on Jul 2, 2026

feat(dataflow): stage 1 — exceptional statement-level CFG per callable
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feat(dataflow): stage 2 — post-dominators and control dependence
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feat(dataflow): stage 3 — access paths, reaching definitions, DDG
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feat(dataflow): stage 4 — PDG assembly and exact backward-slice gate
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feat(dataflow): stage 5 — alias oracle wiring, Tarjan SCC, global qualification
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feat(dataflow): stages 6–7 — function summaries and SDG assembly
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feat(dataflow): stage 8a — two-phase context-sensitive backward slicing
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feat(dataflow): program_graphs emission, -a 3, --graphs, --graph-field-depth
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feat(dataflow): stage 8b — CPG projection through the Neo4j emitter
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docs(dataflow): analysis levels, Architecture & Tooling, schema decisions
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fix(neo4j): namespace the CPG overlay per language (PyCFGNode, PY_* edges)
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