fix: address PR #71 review findings and bump version to 2.2.0

Fix all actionable code review items: add missing domain/flow/step node
types, fix batch numeric sorting, align gate thresholds, merge duplicate
tour steps instead of dropping, add Writing Results section to
assemble-reviewer, use skill-relative script paths, and add func→function
type mapping.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.cursor-plugin/plugin.json

@@ -2,7 +2,7 @@
   "name": "understand-anything",
   "displayName": "Understand Anything",
   "description": "AI-powered codebase understanding — analyze, visualize, and explain any project",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "author": {
     "name": "Lum1104"
   },