feat: Add anchor-based zigzag bend placement via zigzag-at

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Introduce a new `zigzag-at` parameter on `wire.wire` as an alternative
to `zigzag-ratio` for positioning the middle bend segment of a
`style: "zigzag"` wire. Instead of a fraction of the endpoint span,
the bend is placed on the axis of a referenced anchor via CeTZ's
perpendicular operator (`|-`):

  - zigzag-dir "vertical":   segment sits at anchor.x
  - zigzag-dir "horizontal": segment sits at anchor.y

Accepted forms:
  - str                         — raw CeTZ anchor name (e.g. port anchor
                                  "elmt-port-id" or "elmt.center")
  - array / native CeTZ dict    — used as-is
  - (rel: <length>, to: <coord>) with scalar rel — ergonomic axial
    offset, rewritten to (rel: (dx, 0), to: ...) for vertical dir or
    (rel: (0, dy), to: ...) for horizontal dir

`zigzag-ratio` default flipped from `50%` to `auto` (still resolves
to 50%) to allow detecting an explicit user override. Panics on
misuse:
  - `zigzag-at` set together with an explicit `zigzag-ratio`
  - `zigzag-at` set with a non-zigzag `style`

Add `examples.zigzag-at` demonstrating both the string-anchor and the
ergonomic offset forms.

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David Stadelmann committed 2026-09-14 17:47:09 +02:00

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commit 72eab1620c

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