fix(motion): harden accessible motion contract

.claude-plugin/marketplace.json

@@ -1,7 +1,7 @@
 {
   "name": "diagram-design",
   "metadata": {
-    "description": "Branded diagrams across 27 visual types, with semantic system patterns, optional accessible motion, and draw.io or Mermaid import"
+    "description": "Create branded architecture, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, loop/flywheel, nested, tree, org chart, layer stack, Venn, pyramid/funnel, bar, line, Gantt and scatter charts, high-level, process, medallion, data flow, DP integration, or DP security matrix diagrams as standalone HTML/SVG/PNG. Redraw .drawio/.drawio.png/.drawio.svg or Mermaid .mmd sources at a chosen size/detail; onboard brand tokens from a website; add semantic patterns, callouts, accessible motion, or sketchy/hand-drawn styling."
   },
   "owner": {
     "name": "Cathryn Lavery"

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "diagram-design",
-  "description": "Branded diagrams across 27 visual types, with semantic system patterns, optional accessible motion, and draw.io or Mermaid import",
+  "description": "Create branded architecture, IT current-state, flowchart, sequence, state machine, ER/data model, timeline, swimlane, quadrant, radar/spider, loop/flywheel, nested, tree, org chart, layer stack, Venn, pyramid/funnel, bar, line, Gantt and scatter charts, high-level, process, medallion, data flow, DP integration, or DP security matrix diagrams as standalone HTML/SVG/PNG. Redraw .drawio/.drawio.png/.drawio.svg or Mermaid .mmd sources at a chosen size/detail; onboard brand tokens from a website; add semantic patterns, callouts, accessible motion, or sketchy/hand-drawn styling.",
   "version": "2.3.0",
   "homepage": "https://github.com/cathrynlavery/diagram-design",
   "repository": "https://github.com/cathrynlavery/diagram-design",