chore: workspace package stubs with approved dependencies

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

plugins/csv/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "@sttracker/plugin-csv",
+  "private": true,
+  "type": "module",
+  "exports": {
+    "./*": "./src/*.ts"
+  },
+  "dependencies": {
+    "@sttracker/plugin-sdk": "workspace:*"
+  }
+}