fix(treemap): close post-merge fail-open gaps (#127)

* fix(treemap): close fail-open metadata gaps

* chore: bump plugin version to 2.5.18

* fix(treemap): validate declared cell geometry

* fix(package): validate YAML escape sequences

* fix(package): bound Unicode YAML escapes

.codex-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "diagram-design",
   "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, treemap, bar, line, Gantt and scatter charts, high-level, process, medallion, data flow, DP integration, DP security matrix, sankey, fishbone, Wardley map, kanban, user journey, deployment, dependency graph, UML class, story map, or database schema 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": "2.5.17",
+  "version": "2.5.18",
   "author": {
     "name": "Cathryn Lavery",
     "url": "https://github.com/cathrynlavery"