Unbounded line length
=====================

Rule · bucket: judgment · severity: note · detector: none · since: v0.1.0
Section: Things to avoid
Group: Typography

Forbidden:
  Paragraphs spanning the full width of a wide viewport

Instead:
  Cap at `--measure-prose` (68ch editorial, 60ch product, 72ch operator). Applies to any run of prose in any mode.

**And do not let a layout choice push it far under.** The readable band is 40–80 characters (`02-tokens.md`); the cap is the only half stated here, so a column can be halved indefinitely and still satisfy this rule while reading worse at every step. A narrow viewport that cannot reach 40 is a constraint and fine. Splitting a capped column into two side-by-side panels, and rendering prose at 41 characters in a mode whose own measure selects 68, is a choice — and it is choosing density over legibility, which is the trade `M-01` says editorial does not make.