[trissim]

Saved spatial graph ROI ZIPs carried edge geometry and features but omitted the graph's source declaration. Ordinary native reopening therefore refused the archive for missing source metadata. The existing writer now binds the graph's selected source provenance and coordinate spacing through ROIArchiveSourceMetadata, and puts the same metadata on Output. Geometry and subject/edge features remain unchanged; source selection still belongs to the existing graph context owner.

This main-based release receives only the already integrated graph writer and its two test files from 45f3a721e. It avoids the broader runtime branch and retains main's current materialization behavior.

Validation on main eda0121a8 plus this change: 23 passed in the graph source roundtrip and spatial graph materialization test files; git diff --check passes. Controls cover both declared source planes, complete archive metadata and spacing, exact geometry and subject features, cooperative graph subclasses, and refusal of missing, mixed or conflicting native source metadata. Tests ran on CPU 3. The source-identical existing _tabular_native ABI artifact was reused locally; no package installation or native client was run.

This establishes source/writer/archive behavior. Result-directory publication, installed/public native acceptance, point producer integration, and the broader runtime branch's original R0/R1 obligations remain separate. Historical graph R0 and receiving evidence retain their original source scope in the #404 receiving record; they are not new qualification of this branch. No performance or scientific-run acceptance is claimed.

Refs #404
Refs #134

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