feat: expose boundary handoff report (layer order, inversions, pitch)

[spheceo]

Summary

• Adds getBoundaryHandoffReport() so callers can read actual boundary exits grouped by physical layer without reverse-engineering a solved SRJ.
• Reports requested-vs-actual order, pairwise inversions, per-exit deviation, and minimum along-edge pitch.
• Attaches the report to FanoutSolver.getOutput() as boundaryHandoff. This is a read-only view of existing plans and does not change routing.

This is the small main-based solver primitive requested in #130 (handoff routability as a first-class result), not another stacked experiment-wide fix.

Test plan

• bun test tests/boundary-handoff-report.test.ts
• Confirm a DRAM/orbit caller can read output.boundaryHandoff.layers instead of reconstructing exit order from traces

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[spheceo]

This is the small main-based handoff report primitive from #130, not a stacked experiment-wide fix.