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Nested subgraph support: Phase 1 parser and graph model #4

@dnvt

Description

@dnvt

Summary

Start Phase 1 of nested subgraph support by adding parent/child subgraph structure in the parser and graph model.

Scope

  • add parent/child metadata to graph subgraphs
  • preserve nested subgraph structure during parse
  • keep node membership associated with the innermost subgraph
  • add parser/model tests for nested hierarchy

Context

Tracked by planning/NESTED_SUBGRAPH_SUPPORT.md and analysis/2026-04-08-nested-subgraph-containment.md.

Out of Scope

  • hierarchical layout/envelope containment
  • nested portal routing
  • nested border rendering polish

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