chore: bump version to 0.3.1

- Update package.json version
- Update artifacthub-pkg.yml version and archive URL
- Add PROJECT_ASSESSMENT.md for tracking improvements
- Add deployment/ directory with plugin loading fix documentation

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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "headlamp-polaris-plugin",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "description": "Headlamp plugin for Fairwinds Polaris audit results",
   "scripts": {
     "start": "headlamp-plugin start",