refactor: use error function for missing tool detection

- Add `error` helper to print red-colored error messages
- Replace hardcoded "not found" strings with `error` calls
- Add checks for uv, pipx, nodejs, pnpm, and mise

,

@@ -11,8 +11,17 @@ echo "PATH:" $(echo "$PATH" | tr ':' '\n' | wc -l) "paths [Please run ',path' to
 
 echo ""
 
-echo "Ruby:" $(command -v ruby || echo "not found")
-echo "Python:" $(command -v python || echo "not found")
+error() {
+    echo -e "\033[31m$1\033[0m"
+}
 
-echo "llm:" $(command -v llm || echo "not found")
+echo "Ruby:" $(command -v ruby || error "not found")
+echo "Python:" $(command -v python || error "not found")
+echo "uv:" $(command -v uv || error "not found")
+echo "pipx:" $(command -v pipx || error "not found")
+echo "nodejs:": $(command -v node || error "not found")
+echo "pnpm:" $(command -v pnpm || error "not found")
+echo "mise:" $(command -v mise || error "not found")
+
+echo "llm:" $(command -v llm || error "not found")