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/root-cause-tracing.md

@@ -24,6 +24,7 @@ digraph when_to_use {
 ```
 
 **Use when:**
+
 - Error happens deep in execution (not at entry point)
 - Stack trace shows long call chain
 - Unclear where invalid data originated
@@ -32,17 +33,21 @@ digraph when_to_use {
 ## The Tracing Process
 
 ### 1. Observe the Symptom
+
 ```
 Error: git init failed in /Users/jesse/project/packages/core
 ```
 
 ### 2. Find Immediate Cause
+
 **What code directly causes this?**
+
 ```typescript
 await execFileAsync('git', ['init'], { cwd: projectDir });
 ```
 
 ### 3. Ask: What Called This?
+
 ```typescript
 WorktreeManager.createSessionWorktree(projectDir, sessionId)
   → called by Session.initializeWorkspace()
@@ -51,13 +56,17 @@ WorktreeManager.createSessionWorktree(projectDir, sessionId)
 ```
 
 ### 4. Keep Tracing Up
+
 **What value was passed?**
+
 - `projectDir = ''` (empty string!)
 - Empty string as `cwd` resolves to `process.cwd()`
 - That's the source code directory!
 
 ### 5. Find Original Trigger
+
 **Where did empty string come from?**
+
 ```typescript
 const context = setupCoreTest(); // Returns { tempDir: '' }
 Project.create('name', context.tempDir); // Accessed before beforeEach!
@@ -85,11 +94,13 @@ async function gitInit(directory: string) {
 **Critical:** Use `console.error()` in tests (not logger - may not show)
 
 **Run and capture:**
+
 ```bash
 npm test 2>&1 | grep 'DEBUG git init'
 ```
 
 **Analyze stack traces:**
+
 - Look for test file names
 - Find the line number triggering the call
 - Identify the pattern (same test? same parameter?)
@@ -111,6 +122,7 @@ Runs tests one-by-one, stops at first polluter. See script for usage.
 **Symptom:** `.git` created in `packages/core/` (source code)
 
 **Trace chain:**
+
 1. `git init` runs in `process.cwd()` ← empty cwd parameter
 2. WorktreeManager called with empty projectDir
 3. Session.create() passed empty string
@@ -122,6 +134,7 @@ Runs tests one-by-one, stops at first polluter. See script for usage.
 **Fix:** Made tempDir a getter that throws if accessed before beforeEach
 
 **Also added defense-in-depth:**
+
 - Layer 1: Project.create() validates directory
 - Layer 2: WorkspaceManager validates not empty
 - Layer 3: NODE_ENV guard refuses git init outside tmpdir
@@ -163,6 +176,7 @@ digraph principle {
 ## Real-World Impact
 
 From debugging session (2025-10-03):
+
 - Found root cause through 5-level trace
 - Fixed at source (getter validation)
 - Added 4 layers of defense