Use winding destinations for breakout route quality

[seveibar]

Summary

• attach downstream PCB destinations to implicit breakout endpoints
• pin the destination-aware winding solver from Support destination-aware breakout edge placement winding-breakout-point-solver#6
• move the QFP RESET outlier to its nearer edge and update routing snapshots
• assert the Pipeline 9 regression fixture routes with zero vias
• verify custom implicit solvers receive board-world destination coordinates

Compatibility

• buses, differential pairs, and dense fanouts keep their declared edge
• unchanged one-edge solves retain legacy gate placement
• the insufficient-fanout failure behavior remains unchanged

Related PRs

• Add AM62L LPDDR4 two-bus fanout repro #3383 provides the AM62L to LPDDR4 two-bus fanout baseline and should merge first
• Support destination-aware breakout edge placement winding-breakout-point-solver#6
• Expose external destinations to implicit breakout solvers props#809
• supersedes Route automatic breakout exits toward external endpoints #3381
• follows the Pipeline 9 default work in feat: make pipeline9 the default autorouter #3378

AM62L baseline comparison

• the four-layer Add AM62L LPDDR4 two-bus fanout repro #3383 repro routes two complete x8 buses (BYTE0 DQ0-DQ7 and BYTE1 DQ8-DQ15) through an AM62L fanout phase, a DRAM fanout phase, and one default global routing phase
• every phase receives all 16 connections; the two fanouts preload 32 traces and the completed route contains 48 PCB trace records
• the Add AM62L LPDDR4 two-bus fanout repro #3383 full-bus PCB snapshot is byte-for-byte unchanged on this branch
• this confirms the destination hint does not alter either grouped DDR package fanout or the final global route in the focused repro

Validation

• bunx biome check --write on changed TypeScript files
• bunx tsc --noEmit
• bun run build
• bun test tests/breakout (19 pass, 2 skip)
• bun test (1432 pass, 40 skip, 0 fail)
• bun test tests/repros/repro-am62l-lpddr4-two-bus-fanout.test.tsx
• bun test tests/breakout/breakout-qfp16-with-header-and-passives.test.tsx --timeout 30000

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Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Ready	Preview	Aug 23, 2026 5:09pm