Pair headed gizmo announcements two to a row, split by text length

Headed gizmo boxes used to share a row equally, up to three of them.
Now placeNotices pairs consecutive ones in the main column and gives the
pair one of the fixed splits — 25/75, 33/67, 50/50, 67/33, 75/25 —
nearest the ratio of the text each shows, so the wordier box gets the
room. The bases add up to 90% so a third box never joins the row, and a
side column, too narrow for two, stacks them.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

1 files changed, 8 insertions, 3 deletions

diff --git a/AGENTS.md b/AGENTS.md
index 679bb64..1cc12fd 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -378,9 +378,14 @@ internal/web/         server.go (host router, middleware, render helpers)
   colours so they fit any theme, except `gizmo`: a box framed in the theme's
   link colour (`.notice-gizmo { border-color }` comes from the theme CSS).
   On wide screens `.notices` is a flex row (the second flexbox in blog.css,
-  stacking on old browsers like `.cols`): headed gizmo boxes (`.headed`)
-  start at 30% and grow, so up to three share a row; every other box takes
-  the whole row.
+  stacking on old browsers like `.cols`). `placeNotices` returns `Notice`
+  (the section + `Width`): in the main column, consecutive headed gizmo
+  boxes (`.headed`) are paired two to a row by `pairNotices`, and
+  `shareRow` gives the pair the `rowShares` split (25/75, 33/67, 50/50,
+  67/33, 75/25) nearest the ratio of their text lengths (`noticeLen`: title
+  + body with tags stripped) as `.w-<percent>` classes whose flex-bases sum
+  to 90% (the leftover grows into both, so a third never fits). Every other
+  box, and every box in a side column, takes the whole row.
 - **Dashboard nav**: `dashnav.html` marks the current tab with `hasPrefix
   .Path`; a new management section needs a tab there.
 - **Languages** (`internal/i18n`, `settings.language`): every blog has a