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/git-utils/src/diff.ts

@@ -141,7 +141,9 @@ export async function listAllFilesInDirectory(
   // Directories to skip
   const skipDirs = new Set([
     "node_modules", ".git", ".automaker", "dist", "build",
-    ".next", ".nuxt", "__pycache__", ".cache", "coverage"
+    ".next", ".nuxt", "__pycache__", ".cache", "coverage",
+    ".venv", "venv", "target", "vendor", ".gradle",
+    "out", "tmp", ".tmp"
   ]);
 
   try {