Document Concorde segfault with 3-node instances#89
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Summary
examples/three_node_crash.pydemonstrating that Concorde crashes (segfault, exit code 139) when given only 3 nodes, even with well-scaled integer coordinatesContext
Discovered while investigating issues #33 and #35 (segfaults). The 3-node crash is a separate root cause from the coordinate scaling problems addressed in PR #88.