fix(sgcr): straighten fork in-line child at the parity boundary#206
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…p, don't skip) A fork parent distributes its child ports around centre, so the in-line child's connector was straight only when its target port fell strictly inside the (possibly narrower / ½-grid-parity-shifted) child face. At the boundary the forced-edge straightening SKIPPED, leaving a ~9px diagonal jog even though parent and child were centre-aligned. Now snap with a 1px parity slack, clamped to the face — straight when reachable, ≤1px at the boundary — while still skipping genuinely-off-to-the-side edges (which must turn). Verified: stress fuzz 10,060 layouts zero violations; vitest 26/26; the arch demo's edge→api→svc→cache spine now renders as one straight line.
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A fork parent's in-line child connector was left diagonal (~9px) when the target port fell a parity-hair outside the child's narrower face — the forced-edge straightening skipped instead of snapping. Now snaps with a 1px parity slack (clamped to face); genuine off-side edges still turn. Stress fuzz 10,060 layouts ZERO violations, vitest 26/26, arch spine now one straight line.