fix: improve phased fanout autorouting

[seveibar]

Summary

• map canonical edge-first fanout positions into explicit solver exit positions while preserving all legacy NinePointAnchor behavior
• route the AM62L upper and lower DDR byte buses to upper and lower bands on the right boundary
• preflight resolved breakout fanout regions and reject phase domains that overlap or lack a via-safe channel
• carry completed source-footprint keepouts into later fanout and global phases
• preserve standalone sequential board fanout phases and the fanout/global endpoint handoff
• reduce the AM62L breakout padding to 2mm on the SoC and 2.5mm on the DRAM, leaving a 2mm routing channel

Dependencies

• @tscircuit/props ^0.0.634, released from Add explicit fanout boundary positions props#812
• @tscircuit/fanout-solver 0.0.36, released from Route fanouts to explicit boundary positions fanout-solver#91

The temporary fanout-solver Git commit pin has been removed. Both Props constraints now use the published release.

Verification

• fresh bun install resolves @tscircuit/props 0.0.634 and @tscircuit/fanout-solver 0.0.36
• bunx tsc --noEmit --pretty false
• 10 focused fanout, separation, compatibility, and AM62L tests pass with 176 assertions
• AM62L phase 0 asserts all 16 SoC fanout exits lie on maxX, with BYTE0 in the upper band and BYTE1 in the lower band
• bun run build
• bun run smoke-test:dist
• git diff --check

Snapshot

Updates the AM62L PCB snapshot to show both DDR buses exiting through the right boundary bands before the global route.

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Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Ready	Preview	Aug 24, 2026 9:41pm

[seveibar]

CI status: the current test, typecheck, and smoke-test failures all have the same expected dependency cause: published @tscircuit/props does not yet export canonicalBusFanoutDirectionValues or the new edge-first types. The solver is already pinned to PR #91 by immutable commit. Once tscircuit/props#812 merges and publishes, I will bump both Props constraints and rerun the matrix.

[seveibar]

NinePointAnchor compatibility follow-up: all nine legacy directives remain on the original inferred/destination-guided path in scalar and object form. The shared center spelling is now kept unconstrained instead of being forwarded as an explicit exitPosition, and the pre-existing center_right integration fixture is restored.

[seveibar]

Addressed the keepout-ID parsing concern in ccb53fa:

• componentId is now the sole source-component identity.
• isFanoutSourceKeepout explicitly marks the obstacle role.
• phase handoff no longer inspects, slices, prefixes, or deduplicates by obstacleId.
• added a regression with opaque keepout IDs and an unmarked prefix-shaped impostor to prevent ID parsing from returning.

Validated with the AM62L repro, the focused metadata regression, and tsc --noEmit.

[tscircuitbot]

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Impact: Major

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