refactor: Address PR review feedback on shared packages

- Standardize vitest to v4.0.16 across all packages
- Clean up type imports in events.ts (remove verbose inline casting)
- Expand skipDirs to support Python, Rust, Go, PHP, Gradle projects
- Document circular dependency prevention in @automaker/types
- Add comprehensive error handling documentation to @automaker/git-utils

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

libs/platform/package.json

@@ -19,6 +19,6 @@
   "devDependencies": {
     "@types/node": "^22.10.5",
     "typescript": "^5.7.3",
-    "vitest": "^3.1.4"
+    "vitest": "^4.0.16"
   }
 }