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[Critical] Make graph semantics explicit: simple vs multi graph types - #1194

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isPANN wants to merge 11 commits into

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fix/simple-graph-invariant

Open

[Critical] Make graph semantics explicit: simple vs multi graph types#1194
isPANN wants to merge 11 commits into
mainfrom
fix/simple-graph-invariant

Commits on Oct 12, 2026
- Enforce the simple graph invariant across construction paths
  
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- Clarify graph domains in problem definitions
  
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  2b79637
- Separate simple directed graphs from multi graph types
  
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  c0aa2ab
- Rename directed graph types to SimpleDigraph and MultiDigraph
  
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- Cover mixed multigraph workflows and remove obsolete simple-graph branches
  
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  c4ff092
- Simplify graph construction and reuse borrowed arc iteration
  
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  6faa7ec
- Fix and verify the simple-graph TSP ILP reduction
  
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  6936e4c
- Reuse parameter fixtures and speed up exhaustive TSP checks
  
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- Bound slow test fixtures and verify optimization certificates
  
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  6ce204f
- Return construction errors from graph create paths
  
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  06677c9
- Simplify graph verification fixtures and test helpers
  
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  878b10d