chore: bump to 2.3.2 and sync version manifest list

Bumps all five version-carrying manifests to 2.3.2, bringing
.copilot-plugin/plugin.json back in sync (was stuck at 2.2.0), and
updates CLAUDE.md to reflect the true set of files that must move
together: the nested understand-anything-plugin/.claude-plugin/plugin.json
and .copilot-plugin/plugin.json were missing, and marketplace.json was
incorrectly listed (its plugins[] entry does not support a version field).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.copilot-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "understand-anything",
   "description": "AI-powered codebase understanding — analyze, visualize, and explain any project",
-  "version": "2.2.0",
+  "version": "2.3.2",
   "author": {
     "name": "Lum1104"
   },