fix: ensure correct layout variant count generation in UI workflow

Fix layout strategy generation issues across UI design commands:
- consolidate.md: Enhance layout synthesis prompt with explicit examples and requirements
  * Add concrete 3-layout example to clarify expected output structure
  * Emphasize requirement to generate EXACTLY N strategies (not more, not less)
  * Add sequential ID validation (layout-1, layout-2, ..., layout-N)
- explore-auto.md: Add missing --layout-variants parameter to consolidate command call
  * Phase 2 now passes layout_variants count to ensure correct strategy generation
  * Prevents mismatch between requested layouts and generated strategies
- extract.md: Update next step suggestions to include --layout-variants parameter
  * Users now see optional [--layout-variants <count>] in command examples
  * Improves discoverability of layout customization option

Before: consolidate would only generate default 3 layouts even when user specified different count
After: consolidate receives and respects user-specified layout variant count

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

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

.claude/commands/workflow/ui-design/explore-auto.md

@@ -415,7 +415,8 @@ SlashCommand(command)
 run_base_flag = "--base-path \"{base_path}\""
 
 # Use count-based parameter with --keep-separate for matrix mode
-command = "/workflow:ui-design:consolidate {run_base_flag} --variants {style_variants} --keep-separate"
+# IMPORTANT: Pass --layout-variants to ensure correct number of layout strategies are generated
+command = "/workflow:ui-design:consolidate {run_base_flag} --variants {style_variants} --layout-variants {layout_variants} --keep-separate"
 SlashCommand(command)
 ```
 **Result**: Generates `style_variants` independent design systems: