refactor: Convert scenarios to ERB templates

- Move scenario JSON files to app/assets/scenarios/
- Rename to .erb extension (24 scenarios converted)
- Keep .ink files in scenarios/ink/ for JIT compilation
- Each scenario now in own directory
- Add conversion script for future use

scripts/convert-scenarios.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# Convert all scenario JSON files to ERB structure
+
+echo "Converting scenario files to ERB templates..."
+
+# Get all scenario JSON files
+scenarios=$(ls scenarios/*.json 2>/dev/null | xargs -n1 basename | sed 's/\.json$//')
+
+# Process all scenarios
+echo ""
+echo "=== Processing Scenarios ==="
+for scenario in $scenarios; do
+  if [ -f "scenarios/${scenario}.json" ]; then
+    echo "Processing: $scenario"
+
+    # Create directory
+    mkdir -p "app/assets/scenarios/${scenario}"
+
+    # Move and rename (just rename to .erb, don't modify content yet)
+    mv "scenarios/${scenario}.json" "app/assets/scenarios/${scenario}/scenario.json.erb"
+
+    echo "  ✓ Moved to app/assets/scenarios/${scenario}/scenario.json.erb"
+  else
+    echo "  ⚠ File not found: scenarios/${scenario}.json (skipping)"
+  fi
+done
+
+echo ""
+echo "=== Summary ==="
+echo "Converted files:"
+find app/assets/scenarios -name "scenario.json.erb" | wc -l
+echo ""
+echo "Directory structure:"
+ls -d app/assets/scenarios/*/
+echo ""
+echo "✓ Conversion complete!"
+echo ""
+echo "IMPORTANT:"
+echo "- Files have been renamed to .erb but content is still JSON"
+echo "- ERB randomization (random_password, etc.) will be added in Phase 4"
+echo "- For now, scenarios work as-is with static passwords"