[Codex] Fix net-label-only trace routing

[caaeco]

Summary

• isolate physical direct-connectivity data from logical net-label connectivity
• restrict primary MSP and long-distance routing to directly wired nets
• add focused regressions proving net-label-only connections do not produce physical traces
• update affected visual snapshots and repro expectations to reflect removal of the spurious traces

Root cause

netConnMap was initialized with the mutable backing map from directConnMap. Adding logical netConnections therefore also mutated the direct-only connectivity map, and both routing stages iterated the merged connectivity. Net-label-only pins were consequently treated as physical wires.

Validation

• bun test: 73 passed, 4 skipped, 0 failed
• pnpm run build: passed (ESM + declarations)
• git diff --check: passed

/claim #79

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	Jun 21, 2026 2:47pm