Danila Fedorin
904f6375be
Each graph-composition operator includes its operands via an index translation preserving node payloads and edges. Capture that once as GGraph.Embed (a structure, not a class: for g ; g both inclusions share the type Embed g (g <~> g), so instance resolution could pick the wrong copy) with five named witnesses, and replace the five structurally identical trace-lifting inductions in Properties.lean with a single generic Trace.embed plus one-line corollaries. The same witnesses' nodes_eq fields will back the upcoming AST-id/CFG label bijection, so the per-operator content is stated exactly once. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>