Add skills installation to all 3 installers (manual, auto, prompt)

FEATURES:
- All 3 installation methods now include skills installation
- Skills are user-invocable slash commands (like /ui-ux-pro-max)

CHANGES:

1. Interactive Installer (interactive-install-claude.sh)
   - Added skills directory creation
   - Automatic skills installation from repository
   - Copies all skills to ~/.claude/skills/
   - Makes Python scripts executable
   - Displays skills count in summary

2. Master Prompt (MASTER-PROMPT.md)
   - Updated Step 1.5 with current repository structure
   - Simplified skills installation instructions
   - Removed deprecated external repository references
   - Uses local repository files

3. Manual Installation (README.md)
   - Updated Step 4 with skills installation
   - Clear verification steps
   - Explains what skills provide
   - Proper chmod +x for scripts

SKILLS NOW INCLUDED:
- ui-ux-pro-max: Design patterns, colors, typography
- 50+ design styles (minimalism, glassmorphism, etc.)
- Search 8 domains: landing, style, product, color, typography
- Python script search.py for design recommendations

TESTING:
- All 3 installers tested and working
- Skills install to correct location: ~/.claude/skills/
- Python scripts are executable
- Skills count shows in installation summary

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

interactive-install-claude.sh

@@ -612,7 +612,7 @@ backup_config() {
 create_directories() {
     log_info "Creating directory structure..."
 
-    mkdir -p "$CLAUDE_DIR"/{agents,plugins/cache,plugins/marketplaces,hooks,debug,file-history,paste-cache,projects,session-env,shell-snapshots,todos}
+    mkdir -p "$CLAUDE_DIR"/{skills,agents,plugins/cache,plugins/marketplaces,hooks,debug,file-history,paste-cache,projects,session-env,shell-snapshots,todos}
 
     if [ "$INSTALL_ENGINEERING" = true ]; then mkdir -p "$CLAUDE_DIR/agents/engineering"; fi
     if [ "$INSTALL_MARKETING" = true ]; then mkdir -p "$CLAUDE_DIR/agents/marketing"; fi
@@ -725,6 +725,33 @@ install_agents() {
         log_info "Installing agent-updater for automatic sync..."
     fi
 
+    # ============================================
+    # INSTALL SKILLS
+    # User-invocable skills (slash commands)
+    # ============================================
+    if [ -d "$SCRIPT_DIR/skills" ]; then
+        log_info "Installing skills..."
+        mkdir -p "$CLAUDE_DIR/skills"
+
+        # Copy all skill directories
+        for skill_dir in "$SCRIPT_DIR/skills"/*; do
+            if [ -d "$skill_dir" ]; then
+                skill_name=$(basename "$skill_dir")
+                log_info "  → Installing skill: $skill_name"
+                cp -r "$skill_dir" "$CLAUDE_DIR/skills/"
+
+                # Make scripts executable
+                if [ -d "$CLAUDE_DIR/skills/$skill_name/scripts" ]; then
+                    chmod +x "$CLAUDE_DIR/skills/$skill_name/scripts"/*.py 2>/dev/null || true
+                fi
+            fi
+        done
+
+        log_success "✓ Skills installed to: $CLAUDE_DIR/skills/"
+    else
+        log_warning "Skills directory not found at $SCRIPT_DIR/skills"
+    fi
+
     # Install sync-agents.sh script
     if [ -f "$SCRIPT_DIR/sync-agents.sh" ]; then
         log_info "Installing sync-agents.sh script..."
@@ -733,6 +760,11 @@ install_agents() {
         log_success "sync-agents.sh installed (run: ~/.claude/sync-agents.sh)"
     fi
 
+    if [ -d "$CLAUDE_DIR/skills" ]; then
+        skill_count=$(find "$CLAUDE_DIR/skills" -maxdepth 1 -type d | wc -l)
+        skill_count=$((skill_count - 1))  # Subtract 1 for the skills directory itself
+        log_success "Skills installed: $skill_count skill(s)"
+    fi
     log_success "Agents installed: $SELECTED_AGENTS"
 }