fix: skip recovery for already-connected same-net pairs

[GokulPandi-M]

Reproduction

Reproduction: #1211. Until that PR merges, this branch carries the same captured solver input so the fix PR can show the corrected snapshot from the exact pipeline repro.

Summary

• Skips unrouted-trace recovery when both endpoints are already joined through intersecting traces on the same net.
• Prevents recovery from adding the redundant route that becomes a near-parallel VREF branch.
• Adds a focused unit test and updates the exact acoustic-tuner pipeline assertion and SVG snapshot.

Implementation

Recovery builds the connected component containing the first endpoint from existing same-net traces. Traces join that component when they share a pin or intersect geometrically. If the second endpoint is already in that component, no additional route is generated.

The rule uses only net identity and trace geometry; it has no component names, circuit-specific coordinates, or spacing thresholds.

Validation

• bun test — 407 passed, 4 skipped
• bunx tsc --noEmit
• bun run format:check
• Exact pipeline repro assertion confirms the near-parallel VREF overlap is absent
• Corrected full schematic SVG snapshot inspected locally

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Project	Deployment	Actions	Updated
schematic-trace-solver	Ready	Preview	Sep 16, 2026 6:49pm UTC