Update .gitignore to exclude build artifacts

Add sqlc binary and *.test files to gitignore to prevent
accidentally committing build artifacts to the repository.

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

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

Author: claude

.gitignore

@@ -3,6 +3,10 @@ __pycache__
 .DS_Store
 .*.swp
 
+# Build artifacts
+sqlc
+*.test
+
 # Devenv
 .envrc
 .direnv