Merge main: resolve conflicts, keep plugin-first approach

- Removed re-added collections/ path triggers from CI
- Merged plugin checklist improvements from both branches
- Kept plugin:generate-marketplace script from main
- Removed new ospo-sponsorship collection file (plugin already exists)
- Dropped obsolete plugin:migrate and plugin:refresh scripts

package.json

@@ -6,7 +6,7 @@
   "private": true,
   "scripts": {
     "start": "npm run build",
-    "build": "node ./eng/update-readme.mjs",
+    "build": "node ./eng/update-readme.mjs && node ./eng/generate-marketplace.mjs",
     "contributors:add": "all-contributors add",
     "contributors:report": "node ./eng/contributor-report.mjs",
     "contributors:generate": "all-contributors generate",
@@ -15,6 +15,7 @@
     "plugin:create": "node ./eng/create-plugin.mjs",
     "skill:validate": "node ./eng/validate-skills.mjs",
     "skill:create": "node ./eng/create-skill.mjs",
+    "plugin:generate-marketplace": "node ./eng/generate-marketplace.mjs",
     "website:data": "node ./eng/generate-website-data.mjs",
     "website:dev": "npm run website:data && npm run --prefix website dev",
     "website:build": "npm run build && npm run website:data && npm run --prefix website build",