fix: address self-review findings

.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "diagram-design",
-  "description": "Editorial-quality technical and product diagrams — 27 types rendered as standalone HTML with inline SVG, skinnable to match your brand, plus draw.io import that redraws existing .drawio files at a chosen format, size, and level of detail",
-  "version": "2.1.0",
+  "description": "Editorial-quality technical and product diagrams — 27 types rendered as standalone HTML with inline SVG, skinnable to match your brand, plus draw.io and Mermaid import at a chosen format, size, and level of detail",
+  "version": "2.2.0",
   "homepage": "https://github.com/cathrynlavery/diagram-design",
   "repository": "https://github.com/cathrynlavery/diagram-design",
   "license": "MIT",
@@ -13,6 +13,7 @@
     "visualization",
     "editorial",
     "drawio",
+    "mermaid",
     "import"
   ]
 }