Phase 2b: jscan adopts core/cfg + core/graph + core/lsh (CFG analyses, coupling, MinHash) #11

Adopt the remaining language-independent kernels: CFG data structures and analyses (reachability, complexity, dead code), dependency graph algorithms (Tarjan SCC, Martin metrics), and LSH/MinHash.

Blocked by #8.

Tasks

• CFG: keep cfg_builder.go (JS control-flow semantics, hoisting) building core/cfg.CFG; implement StatementClassifier + NoOpClassifier (bare ;) on jscan's parser nodes
• Dead code: adopt core/cfg.DetectDeadCode + LineFinding/MergeContiguousFindings/SortLineFindings; keep line/snippet enrichment language-side
• Complexity: adopt core/cfg.ComputeComplexity with a ComplexityContributor for JS logical operators (&&, ||, ??, ternary)
• Coupling/cycles: adopt core/graph (DirectedGraph impl on jscan's dependency graph, Martin metrics with export-ratio AbstractnessFunc, Tarjan cycles)
• LSH/MinHash: adopt core/lsh (should be a drop-in; zero drift expected)
• Scoring: adopt core/domain/scoring.go shared calculators + grade mapping; keep jscan's count-ratio complexity penalty and per-file dead-code penalty composing with them
• Update tests; delete superseded code

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