Overhaul /anti-patterns with visuals, detection layers, and LLM rules

Three additions to the anti-patterns catalog page, all sourced from a
new content/site/anti-patterns-catalog.js file so the user's parallel
edits to src/detect-antipatterns.mjs don't conflict with display metadata.

1. Detection layer badge per rule. Three layers:
     cli     - static analysis or jsdom. Runs from `npx impeccable detect`
               on files, no browser required. 23 of 25 current rules.
     browser - needs real browser layout (getBoundingClientRect).
               Runs via the browser extension or Puppeteer, not the
               plain CLI. Only 2 rules: cramped-padding and line-length,
               as documented in tests/detect-antipatterns-browser.test.mjs.
     llm     - no deterministic detector. Flagged by /critique's LLM
               review pass. 13 rules live only in the skill's DON'T list.
   Each card renders a mono pill with the layer label, color-coded per
   layer (neutral mist for CLI, blue tint for browser, amber tint for LLM).
   The How-to-read legend grows a dl explaining what each layer means.

2. Inline visual example per detected rule. All 25 detection rules get
   a ~140px tall preview area at the top of the card showing the bad
   pattern as live HTML (cream background, self-contained inline styles).
   Visuals for side-tab, gradient-text, dark-glow, nested-cards, and the
   rest let you see what the detector is actually flagging. LLM-only
   rules ship without visuals for now; their card bodies take the full
   card height.

3. LLM-only rules merged into the sections. Parsed out from
   source/skills/impeccable/SKILL.md DON'T lines that the detector
   doesn't cover: Syne, monospace-as-technical, dark-mode-default,
   everything-in-cards, identical-card-grids, hero-metric-layout,
   glassmorphism, sparkline-decoration, generic-drop-shadows,
   modal-reflex, every-button-primary, redundant-headers,
   mobile-amputation. Each renders like a detection rule card but
   shows the 'LLM only' layer badge and has no rule id chip. They
   slot into the same section groups as detected rules (Interaction
   and Responsive sections added to the section order so these get
   real headings).

- scripts/lib/sub-pages-data.js: imports the catalog, enriches
  detected rules with { layer, visual }, appends LLM_ONLY_RULES with
  layer: 'llm'. Re-exports LAYER_LABELS and LAYER_DESCRIPTIONS for
  the generator.
- scripts/build-sub-pages.js: renderRuleCard adds the visual block
  and the layer badge; LLM rules drop the rule id chip since their id
  is just an internal slug. groupRulesBySection now extends the
  primary order with whatever extra sections rules reference.
- public/css/sub-pages.css: .rule-card now has a .rule-card-visual
  preview area on top with border-bottom, body section below. New
  .rule-card-layer pill styling per layer. Layer legend dl using a
  2-column grid for badge -> description.

Dev server serves 38 total cards (25 detected + 13 LLM) across 8
sections: Visual Details, Typography, Color & Contrast, Layout & Space,
Motion, Interaction, Responsive, General quality.

scripts/lib/sub-pages-data.js

@@ -14,6 +14,13 @@ import fs from 'node:fs';
 import path from 'node:path';
 import { pathToFileURL } from 'node:url';
 import { readSourceFiles, parseFrontmatter } from './utils.js';
+import {
+  DETECTION_LAYERS,
+  VISUAL_EXAMPLES,
+  LLM_ONLY_RULES,
+} from '../../content/site/anti-patterns-catalog.js';
+
+export { LAYER_LABELS, LAYER_DESCRIPTIONS } from '../../content/site/anti-patterns-catalog.js';
 
 /**
  * Skills that should be excluded from the index and not get a detail page.
@@ -33,7 +40,6 @@ const SKILL_CATEGORIES = {
   // CREATE - build something new
   impeccable: 'create',
   shape: 'create',
-  overdrive: 'create',
   // EVALUATE - review and assess
   critique: 'evaluate',
   audit: 'evaluate',
@@ -46,6 +52,7 @@ const SKILL_CATEGORIES = {
   bolder: 'refine',
   quieter: 'refine',
   onboard: 'refine',
+  overdrive: 'refine',
   // SIMPLIFY - reduce and clarify
   distill: 'simplify',
   clarify: 'simplify',
@@ -191,8 +198,19 @@ export async function buildSubPageData(rootDir) {
   for (const cat of CATEGORY_ORDER) skillsByCategory[cat] = [];
   for (const skill of skills) skillsByCategory[skill.category].push(skill);
 
-  // Anti-pattern rules, grouped for the index.
-  const rules = readAntipatternRules(rootDir);
+  // Anti-pattern rules, enriched with catalog metadata and merged with
+  // LLM-only rules from the skill's DON'T list.
+  const detectedRules = readAntipatternRules(rootDir).map((r) => ({
+    ...r,
+    layer: DETECTION_LAYERS[r.id] || 'cli',
+    visual: VISUAL_EXAMPLES[r.id] || null,
+  }));
+  const llmRules = LLM_ONLY_RULES.map((r) => ({
+    ...r,
+    layer: 'llm',
+    visual: VISUAL_EXAMPLES[r.id] || null,
+  }));
+  const rules = [...detectedRules, ...llmRules];
 
   // Tutorials: each required file in content/site/tutorials/.
   const tutorialsDir = path.join(contentDir, 'tutorials');