B6 — Route the graph view through the public API

[KrasForge]

Part of EPIC B0 #293

Depends on: B1 #294, B2 #295
Blocks: B7
Parallel with: B4, B5

Context

Critical distinction: the graph store/data stays core; only the d3-force/Sigma/Graphology visualization becomes a feature consuming the API's graph-read methods.

Scope — in

• View pulls nodes/edges/subgraphs via ModuloCoreAPI graph-read methods.
• Remove direct coupling between the view and the graph store internals.

Scope — out

• Do not move the graph store/model out of core.

Acceptance

• View renders entirely from API-provided graph data.
• No view→store-internal imports remain.