feat: add test validation command and improve environment variable handling

- Introduced a new command for validating tests, providing detailed instructions for running tests and fixing failures based on code changes.
- Updated the environment variable handling in the Claude provider to only allow explicitly defined variables, enhancing security and preventing leakage of sensitive information.
- Improved feature loading to handle errors more gracefully and load features concurrently, optimizing performance.
- Centralized port configuration for the Automaker application to prevent accidental termination of critical services.

libs/prompts/package.json

@@ -22,6 +22,7 @@
     "node": ">=22.0.0 <23.0.0"
   },
   "dependencies": {
+    "@automaker/platform": "1.0.0",
     "@automaker/types": "1.0.0"
   },
   "devDependencies": {