format: apply repo prettier (3.8.1) to the folded skills tree

963 markdown files reformatted with the repository's pinned prettier so
pnpm format:check covers the folded tree like every other repo file.

The formatter's embedded-language pass also normalized code fences
(TS semicolons, closed HTML tags in examples, lowercased CSS hex colors,
one renumbered list that skipped an index). Alphanumeric token deltas vs
the fold commit were audited file-by-file; all are formatter-equivalent
markup normalizations plus the four sanitized skills.

packages/mosaic/framework/skills/vitest/references/features-coverage.md

@@ -21,27 +21,22 @@ defineConfig({
     coverage: {
       // Provider: 'v8' (default, faster) or 'istanbul' (more compatible)
       provider: 'v8',
-      
+
       // Enable coverage
       enabled: true,
-      
+
       // Reporters
       reporter: ['text', 'json', 'html'],
-      
+
       // Files to include
       include: ['src/**/*.{ts,tsx}'],
-      
+
       // Files to exclude
-      exclude: [
-        'node_modules/',
-        'tests/',
-        '**/*.d.ts',
-        '**/*.test.ts',
-      ],
-      
+      exclude: ['node_modules/', 'tests/', '**/*.d.ts', '**/*.test.ts'],
+
       // Report uncovered files
       all: true,
-      
+
       // Thresholds
       thresholds: {
         lines: 80,
@@ -51,7 +46,7 @@ defineConfig({
       },
     },
   },
-})
+});
 ```
 
 ## Providers
@@ -104,10 +99,10 @@ coverage: {
     functions: 75,
     branches: 70,
     statements: 80,
-    
+
     // Per-file thresholds
     perFile: true,
-    
+
     // Auto-update thresholds (for gradual improvement)
     autoUpdate: true,
   },
@@ -121,7 +116,7 @@ coverage: {
 ```ts
 /* v8 ignore next -- @preserve */
 function ignored() {
-  return 'not covered'
+  return 'not covered';
 }
 
 /* v8 ignore start -- @preserve */
@@ -201,7 +196,7 @@ vitest --merge-reports --coverage --reporter=json
 - Set thresholds to enforce minimum coverage
 - Use `@preserve` comment to keep ignore hints
 
-<!-- 
+<!--
 Source references:
 - https://vitest.dev/guide/coverage.html
 -->