Target-join and boundary-slot detection now use ResolveNodeSizeClearance
(node dimensions only), while under-node/proximity use
ResolveMinLineClearance (scales with NodeSpacing via ElkLayoutClearance).
Face slot gaps depend on node face geometry, not inter-node spacing.
Routing corridors should scale with spacing for visual breathing room.
Created sprint 008 for wider spacing robustness. NodeSpacing=50 still
fails on target-join (scoring/test detection mismatch needs investigation).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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