feat: refactor UI design workflow for agent-driven execution and default separate mode

## Core Changes

### 1. Fix Token Application Issues (v4.2.1-fix)
- Add convert_tokens_to_css.sh script for design-tokens.json → tokens.css conversion
- Auto-generate Google Fonts @import for web fonts
- Auto-generate global font application rules (body, headings)
- Add Phase 1.8 to generate.md: Token Variable Name Extraction
- Update generate.md Phase 2a: Inject exact variable names into agent prompt
- Fix CSS variable naming mismatches (20+ variables)

### 2. Refactor consolidate.md - Default to Separate Mode
- Remove --keep-separate parameter (now default behavior)
- Remove Unified Mode (Phase 4A) entirely
- Use ui-design-agent for multi-file generation (Phase 4)
- Generate N independent design systems by default
- Update documentation and completion messages
- Add Task(*) to allowed-tools

### 3. Update explore-auto.md Integration
- Remove --keep-separate from Phase 2 consolidate command
- Update comments to reflect default separate mode behavior

### 4. Refactor ui-design-agent.md (v2.0 → v3.0)
- Remove slash command execution logic
- Focus on consolidate.md and generate.md task execution
- Remove workflow orchestration content
- Add MCP integration strategies (Exa + Code Index)
- Integrate v4.2.1-fix changes

## Impact
- All workflows now default to separate design systems (matrix-ready)
- Agent handles multi-file generation efficiently
- Token application issues resolved
- Simplified user experience (fewer parameters)

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

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

.claude/scripts/convert_tokens_to_css.sh

@@ -0,0 +1,225 @@
+#!/bin/bash
+# Convert design-tokens.json to tokens.css with Google Fonts import and global font rules
+# Usage: cat design-tokens.json | ./convert_tokens_to_css.sh > tokens.css
+# Or: ./convert_tokens_to_css.sh < design-tokens.json > tokens.css
+
+# Read JSON from stdin
+json_input=$(cat)
+
+# Extract metadata for header comment
+style_name=$(echo "$json_input" | jq -r '.meta.name // "Unknown Style"' 2>/dev/null || echo "Design Tokens")
+
+# Generate header
+cat <<EOF
+/* ========================================
+   Design Tokens: ${style_name}
+   Auto-generated from design-tokens.json
+   ======================================== */
+
+EOF
+
+# ========================================
+# Google Fonts Import Generation
+# ========================================
+# Extract font families and generate Google Fonts import URL
+fonts=$(echo "$json_input" | jq -r '
+  .typography.font_family | to_entries[] | .value
+' 2>/dev/null | sed "s/'//g" | cut -d',' -f1 | sort -u)
+
+# Build Google Fonts URL
+google_fonts_url="https://fonts.googleapis.com/css2?"
+font_params=""
+
+while IFS= read -r font; do
+  # Skip system fonts and empty lines
+  if [[ -z "$font" ]] || [[ "$font" =~ ^(system-ui|sans-serif|serif|monospace|cursive|fantasy)$ ]]; then
+    continue
+  fi
+
+  # Special handling for common web fonts with weights
+  case "$font" in
+    "Comic Neue")
+      font_params+="family=Comic+Neue:wght@300;400;700&"
+      ;;
+    "Patrick Hand"|"Caveat"|"Dancing Script"|"Architects Daughter"|"Indie Flower"|"Shadows Into Light"|"Permanent Marker")
+      # URL-encode font name and add common weights
+      encoded_font=$(echo "$font" | sed 's/ /+/g')
+      font_params+="family=${encoded_font}:wght@400;700&"
+      ;;
+    "Segoe Print"|"Bradley Hand"|"Chilanka")
+      # These are system fonts, skip
+      ;;
+    *)
+      # Generic font: add with default weights
+      encoded_font=$(echo "$font" | sed 's/ /+/g')
+      font_params+="family=${encoded_font}:wght@400;500;600;700&"
+      ;;
+  esac
+done <<< "$fonts"
+
+# Generate @import if we have fonts
+if [[ -n "$font_params" ]]; then
+  # Remove trailing &
+  font_params="${font_params%&}"
+  echo "/* Import Web Fonts */"
+  echo "@import url('${google_fonts_url}${font_params}&display=swap');"
+  echo ""
+fi
+
+# ========================================
+# CSS Custom Properties Generation
+# ========================================
+echo ":root {"
+
+# Colors - Brand
+echo "  /* Colors - Brand */"
+echo "$json_input" | jq -r '
+  .colors.brand | to_entries[] |
+  "  --color-brand-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Colors - Surface
+echo "  /* Colors - Surface */"
+echo "$json_input" | jq -r '
+  .colors.surface | to_entries[] |
+  "  --color-surface-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Colors - Semantic
+echo "  /* Colors - Semantic */"
+echo "$json_input" | jq -r '
+  .colors.semantic | to_entries[] |
+  "  --color-semantic-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Colors - Text
+echo "  /* Colors - Text */"
+echo "$json_input" | jq -r '
+  .colors.text | to_entries[] |
+  "  --color-text-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Colors - Border
+echo "  /* Colors - Border */"
+echo "$json_input" | jq -r '
+  .colors.border | to_entries[] |
+  "  --color-border-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Typography - Font Family
+echo "  /* Typography - Font Family */"
+echo "$json_input" | jq -r '
+  .typography.font_family | to_entries[] |
+  "  --font-family-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Typography - Font Size
+echo "  /* Typography - Font Size */"
+echo "$json_input" | jq -r '
+  .typography.font_size | to_entries[] |
+  "  --font-size-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Typography - Font Weight
+echo "  /* Typography - Font Weight */"
+echo "$json_input" | jq -r '
+  .typography.font_weight | to_entries[] |
+  "  --font-weight-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Typography - Line Height
+echo "  /* Typography - Line Height */"
+echo "$json_input" | jq -r '
+  .typography.line_height | to_entries[] |
+  "  --line-height-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Typography - Letter Spacing
+echo "  /* Typography - Letter Spacing */"
+echo "$json_input" | jq -r '
+  .typography.letter_spacing | to_entries[] |
+  "  --letter-spacing-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Spacing
+echo "  /* Spacing */"
+echo "$json_input" | jq -r '
+  .spacing | to_entries[] |
+  "  --spacing-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Border Radius
+echo "  /* Border Radius */"
+echo "$json_input" | jq -r '
+  .border_radius | to_entries[] |
+  "  --border-radius-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Shadows
+echo "  /* Shadows */"
+echo "$json_input" | jq -r '
+  .shadows | to_entries[] |
+  "  --shadow-\(.key): \(.value);"
+' 2>/dev/null
+
+echo ""
+
+# Breakpoints
+echo "  /* Breakpoints */"
+echo "$json_input" | jq -r '
+  .breakpoints | to_entries[] |
+  "  --breakpoint-\(.key): \(.value);"
+' 2>/dev/null
+
+echo "}"
+echo ""
+
+# ========================================
+# Global Font Application
+# ========================================
+echo "/* ========================================"
+echo "   Global Font Application"
+echo "   ======================================== */"
+echo ""
+echo "body {"
+echo "  font-family: var(--font-family-body);"
+echo "  font-size: var(--font-size-base);"
+echo "  line-height: var(--line-height-normal);"
+echo "  color: var(--color-text-primary);"
+echo "  background-color: var(--color-surface-background);"
+echo "}"
+echo ""
+echo "h1, h2, h3, h4, h5, h6, legend {"
+echo "  font-family: var(--font-family-heading);"
+echo "}"
+echo ""
+echo "/* Reset default margins for better control */"
+echo "* {"
+echo "  margin: 0;"
+echo "  padding: 0;"
+echo "  box-sizing: border-box;"
+echo "}"