The ProtoID field in BondRef was misleading as it could hold both proto
IDs (from proto+proto bonds) and molecule IDs (from mol+mol bonds).
Rename to SourceID with updated JSON tag to better reflect its purpose.
Changes:
- Rename BondRef.ProtoID to SourceID in types.go
- Update JSON tag from proto_id to source_id
- Update all usages in mol_bond.go and tests
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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