David Stadelmann 19a48951df feat: add s-shape wire style ...

Introduces a new "s-shape" wire style connecting two ports on opposite
cardinal sides (east<->west or north<->south) via 5 segments joined at
4 corners (u1-start, u1-end, u2-start, u2-end). The axis is auto-detected
from port anchors; when both endpoints share the same perpendicular
coordinate (single-block loopback) `s-ratio-mid` is reinterpreted as an
absolute signed offset so the crossbar can still be placed above or
below the endpoints.

Supports anchor-based placement via the `s-at-*` family of parameters
(s-at-1, s-at-mid, s-at-2) analogous to `zigzag-at` and `u-at`.

2026-10-22 00:32:08 +02:00

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