Untangle fence/zig-zag mess#106

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Enivex wants to merge 1 commit intotypst:mainfrom

Enivex:Fix-zigzag-situation

Commits on Jul 4, 2025

Move `fence.dotted` to `dots.v.quad`, rename `fence` to `zigzag`, add ⦚ at the top level
Enivex
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