fix(components): remove gate-evasion CSS from CodeBlock and Eyebrow

CodeBlock declared `font: 12px/1.75 'DM Mono', monospace` and Eyebrow
`font: 600 var(--step-0) ...`, both written as the `font:` shorthand with a
comment saying it was chosen because check-tokens.mjs only matches
`font-size: Npx`.

CodeBlock's rule was also fabricated: `.worktrees pre`, the block the
component documents itself as reproducing, sets no font at all. Dropped it.

Eyebrow keeps var(--step-0) (task 02's decided token) but the 600 weight
matches no legacy declaration -- 500, 700, 700. Marked UNRESOLVED for the
font decision.

src/components/primitives/CodeBlock.astro

@@ -33,13 +33,14 @@ const { tone = 'gold', label } = Astro.props;
     background: var(--ink);
   }
 
-  /* `font:` shorthand so check-tokens.mjs (which only matches `font-size: Npx`)
-     leaves us alone. */
-  .code-block code {
-    font:
-      12px/1.75 'DM Mono',
-      monospace;
-  }
+  /* Deliberately no font declaration. `.worktrees pre` — the block this
+     component reproduces — sets none either, so the text inherits the UA
+     default for `pre`. Declaring one here would change how the page renders,
+     which is a redesign, not a refactor.
+     Two *other* legacy blocks do set one, and neither is this component's job:
+     `chapters.css .panel code` (14px/1.8 ui-monospace) and
+     `skills-review/styles.css .preview code` (12px/1.65 ui-monospace). Whoever
+     migrates those needs tokens for them first. */
 
   /* Lighter text used by `.skills>pre` and a handful of preview blocks where
      the content reads as documentation rather than a terminal session. */

src/components/primitives/Eyebrow.astro

@@ -30,9 +30,15 @@ const { label, tone = 'accent', as: Tag = 'p' } = Astro.props;
 <style>
   .eyebrow {
     margin: 0;
-    /* `font:` shorthand so check-tokens.mjs (which only matches `font-size: Npx`)
-       leaves us alone. 10px / 600 / .1em is the canonical midpoint of the
-       10–11px / 500–700 / .08–.1em range the design-system context documents. */
+    /* UNRESOLVED — this consolidates three drifted legacy declarations and
+       matches none of them exactly:
+         styles.css              500 10px 'DM Mono', monospace   .1em
+         chapters.css            700 11px monospace              .12em
+         skills-review/styles.css 700 10px monospace             .1em
+       `var(--step-0)` (11px) is task 02's decided token, so the size is
+       deliberate. The 600 weight is not — legacy uses 500 and 700, never 600.
+       Settle this with the font decision in .agents/context/design-system.md;
+       until then this renders slightly differently from every source block. */
     font:
       600 var(--step-0) 'DM Mono',
       monospace;