Name the monospace faces once, as a typeface token and md-mono

Both applications show values a person reads or types character by
character: SealShare's share tokens and recovery codes, ReStride's file
and folder names and its keyboard shortcuts. The package wrote the
platform's monospace stack twice (the reset's <code>, <kbd>, <samp> and
the mono field) and gave everything else nothing, so an app copied the
stack by hand. --md-ref-typeface-mono now holds it, read by the reset,
the field and a new md-mono text class; the guard points font-mono at
<code> or md-mono. Not an M3 token: M3 names a brand and a plain
typeface and nothing for code. Decided with the user (plan step 46).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Testing/DesignGuard.php

@@ -161,9 +161,10 @@ class DesignGuard
         ['/^(?:cursor-[\w-]+|pointer-events-(?:none|auto)|select-(?:none|text|all|auto)|touch-[\w-]+|resize(?:-[xy]|-none)?|appearance-(?:none|auto)|scroll-(?:smooth|auto)|-?scroll-[mp][trblxyse]?-[\w.]+|snap-[\w-]+)$/', 'Tailwind interactivity utility `%s` compiles to nothing — write the rule in your own CSS'],
         ['/^(?:aspect-(?:auto|square|video|\d+\/\d+)|object-(?:contain|cover|fill|none|scale-down|top|bottom|center|left|right|left-top|left-bottom|right-top|right-bottom))$/', 'Tailwind media utility `%s` compiles to nothing — write `aspect-ratio`/`object-fit` in your own CSS'],
         ['/^font-(?:sans|serif)$/', 'Tailwind\'s `%s` compiles to nothing — the foundation already sets the brand typeface; any other `font-family` is your own CSS'],
+        ['/^font-mono$/', 'Tailwind\'s `%s` compiles to nothing — put the value in `<code>`, `<kbd>` or `<samp>`, or use `md-mono` (text.css)'],
         ['/^antialiased$/', 'Tailwind\'s `%s` compiles to nothing — the foundation already smooths text in grayscale (base.css); drop it'],
         ['/^(?:underline|no-underline)$/', 'Tailwind\'s `%s` compiles to nothing — `md-link` draws a link (interaction.css); any other decoration is your own CSS'],
-        ['/^(?:uppercase|lowercase|capitalize|normal-case|italic|not-italic|overline|line-through|underline-offset-\w+|decoration-(?:\d+|solid|double|dotted|dashed|wavy|auto|from-font|clone|slice)|font-mono|subpixel-antialiased|whitespace-(?:normal|pre|pre-line|pre-wrap|break-spaces)|break-(?:words|all|keep|normal)|wrap-(?:break-word|anywhere|normal)|text-(?:wrap|balance|pretty|ellipsis|clip|justify)|line-clamp-(?:\d+|none)|not-sr-only|list-(?:disc|decimal|none|inside|outside)|align-(?:baseline|top|middle|bottom|text-top|text-bottom|sub|super)|indent-[\w.]+|hyphens-(?:none|manual|auto)|(?:normal|lining|oldstyle|proportional)-nums|ordinal|slashed-zero|(?:diagonal|stacked)-fractions)$/', 'Tailwind text utility `%s` compiles to nothing — write the rule in your own CSS'],
+        ['/^(?:uppercase|lowercase|capitalize|normal-case|italic|not-italic|overline|line-through|underline-offset-\w+|decoration-(?:\d+|solid|double|dotted|dashed|wavy|auto|from-font|clone|slice)|subpixel-antialiased|whitespace-(?:normal|pre|pre-line|pre-wrap|break-spaces)|break-(?:words|all|keep|normal)|wrap-(?:break-word|anywhere|normal)|text-(?:wrap|balance|pretty|ellipsis|clip|justify)|line-clamp-(?:\d+|none)|not-sr-only|list-(?:disc|decimal|none|inside|outside)|align-(?:baseline|top|middle|bottom|text-top|text-bottom|sub|super)|indent-[\w.]+|hyphens-(?:none|manual|auto)|(?:normal|lining|oldstyle|proportional)-nums|ordinal|slashed-zero|(?:diagonal|stacked)-fractions)$/', 'Tailwind text utility `%s` compiles to nothing — write the rule in your own CSS'],
         ['/^bg-(?:(?:gradient-to|linear-to)-[a-z]+|radial|conic|cover|contain|auto|center|top|bottom|left|right|no-repeat|repeat(?:-[xy])?|fixed|local|scroll|none|clip-[a-z]+|origin-[a-z]+)$/', 'Tailwind background utility `%s` compiles to nothing — write the rule in your own CSS'],
     ];