fix: restore root package.json for semantic-release

The Mastra removal (a431758) deleted the root package.json, breaking
the Release workflow. Semantic-release needs it for version bumping.

Author: fg-nava

package.json

@@ -0,0 +1,5 @@
+{
+  "name": "labs-asp",
+  "version": "1.10.0",
+  "private": true
+}