fix(FN-1537): stabilize CI workflows and fix version tests

- Update GitHub Actions workflows to use Node.js 24 (actions/setup-node@v5)
- Add private packages to .changeset/config.json ignore array
- Fix version string tests to read dynamically from package.json
- Add FN-1537 documentation to .fusion/memory.md

.changeset/config.json

@@ -7,5 +7,15 @@
   "access": "public",
   "baseBranch": "main",
   "updateInternalDependencies": "patch",
-  "ignore": []
+  "ignore": [
+    "@fusion/core",
+    "@fusion/dashboard",
+    "@fusion/engine",
+    "@fusion/tui",
+    "@fusion/plugin-sdk",
+    "@fusion-plugin-examples/auto-label",
+    "@fusion-plugin-examples/ci-status",
+    "@fusion-plugin-examples/notification",
+    "@fusion-plugin-examples/settings-demo"
+  ]
 }