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>

resources/css/text.css

@@ -42,6 +42,9 @@
  *   md-nowrap                 never wraps: a figure with its unit, a short label
  *   md-tabular                tabular figures, where digits change often (tables, clocks,
  *                             counters), so the layout does not shift
+ *   md-mono                   the monospace typeface (`--md-ref-typeface-mono`), for a value read
+ *                             character by character outside `<code>`; after an `md-type-*` class,
+ *                             whose `font` would otherwise set the brand face
  *   md-visually-hidden        read by assistive technology, not drawn: a label a picture already
  *                             gives the eye
  *
@@ -309,6 +312,10 @@
         font-variant-numeric: tabular-nums;
     }
 
+    .md-mono {
+        font-family: var(--md-ref-typeface-mono);
+    }
+
     .md-visually-hidden {
         position: absolute;
         width: 1px;