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/systematic-debugging/defense-in-depth.md

@@ -12,6 +12,7 @@ Single validation: "We fixed the bug"
 Multiple layers: "We made the bug impossible"
 
 Different layers catch different cases:
+
 - Entry validation catches most bugs
 - Business logic catches edge cases
 - Environment guards prevent context-specific dangers
@@ -20,6 +21,7 @@ Different layers catch different cases:
 ## The Four Layers
 
 ### Layer 1: Entry Point Validation
+
 **Purpose:** Reject obviously invalid input at API boundary
 
 ```typescript
@@ -38,6 +40,7 @@ function createProject(name: string, workingDirectory: string) {
 ```
 
 ### Layer 2: Business Logic Validation
+
 **Purpose:** Ensure data makes sense for this operation
 
 ```typescript
@@ -50,6 +53,7 @@ function initializeWorkspace(projectDir: string, sessionId: string) {
 ```
 
 ### Layer 3: Environment Guards
+
 **Purpose:** Prevent dangerous operations in specific contexts
 
 ```typescript
@@ -60,9 +64,7 @@ async function gitInit(directory: string) {
     const tmpDir = normalize(resolve(tmpdir()));
 
     if (!normalized.startsWith(tmpDir)) {
-      throw new Error(
-        `Refusing git init outside temp dir during tests: ${directory}`
-      );
+      throw new Error(`Refusing git init outside temp dir during tests: ${directory}`);
     }
   }
   // ... proceed
@@ -70,6 +72,7 @@ async function gitInit(directory: string) {
 ```
 
 ### Layer 4: Debug Instrumentation
+
 **Purpose:** Capture context for forensics
 
 ```typescript
@@ -98,12 +101,14 @@ When you find a bug:
 Bug: Empty `projectDir` caused `git init` in source code
 
 **Data flow:**
+
 1. Test setup → empty string
 2. `Project.create(name, '')`
 3. `WorkspaceManager.createWorkspace('')`
 4. `git init` runs in `process.cwd()`
 
 **Four layers added:**
+
 - Layer 1: `Project.create()` validates not empty/exists/writable
 - Layer 2: `WorkspaceManager` validates projectDir not empty
 - Layer 3: `WorktreeManager` refuses git init outside tmpdir in tests
@@ -114,6 +119,7 @@ Bug: Empty `projectDir` caused `git init` in source code
 ## Key Insight
 
 All four layers were necessary. During testing, each layer caught bugs the others missed:
+
 - Different code paths bypassed entry validation
 - Mocks bypassed business logic checks
 - Edge cases on different platforms needed environment guards