refactor: Reorganize repository structure for optimal learning path

Reorder folders based on learning dependencies, complexity, and frequency of use:
- 01-slash-commands (unchanged) - Quick wins for beginners
- 02-memory (was 03) - Essential foundation
- 03-skills (was 05) - Auto-invoked capabilities
- 04-subagents (was 02) - Task delegation
- 05-mcp (was 04) - External integration
- 06-hooks (was 07) - Event automation
- 07-plugins (was 06) - Bundled solutions
- 08-checkpoints (unchanged) - Safe experimentation
- 09-advanced-features (unchanged) - Power user tools

Documentation improvements:
- Add LEARNING-ROADMAP.md with detailed milestones and exercises
- Simplify README.md for better scannability
- Consolidate Quick Start and Getting Started sections
- Combine Feature Comparison and Use Case Matrix tables
- Reorder README sections: Learning Path → Quick Reference → Getting Started
- Update all cross-references across module READMEs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

06-hooks/format-code.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+# Auto-format code before writing
+# Hook: PreToolUse:Write
+
+FILE=$1
+
+if [ -z "$FILE" ]; then
+  echo "Usage: $0 <file_path>"
+  exit 1
+fi
+
+# Detect file type and format accordingly
+case "$FILE" in
+  *.js|*.jsx|*.ts|*.tsx)
+    if command -v prettier &> /dev/null; then
+      echo "Formatting JavaScript/TypeScript file: $FILE"
+      prettier --write "$FILE"
+    fi
+    ;;
+  *.py)
+    if command -v black &> /dev/null; then
+      echo "Formatting Python file: $FILE"
+      black "$FILE"
+    fi
+    ;;
+  *.go)
+    if command -v gofmt &> /dev/null; then
+      echo "Formatting Go file: $FILE"
+      gofmt -w "$FILE"
+    fi
+    ;;
+  *.rs)
+    if command -v rustfmt &> /dev/null; then
+      echo "Formatting Rust file: $FILE"
+      rustfmt "$FILE"
+    fi
+    ;;
+  *.java)
+    if command -v google-java-format &> /dev/null; then
+      echo "Formatting Java file: $FILE"
+      google-java-format -i "$FILE"
+    fi
+    ;;
+esac
+
+exit 0