fix(install): info/ok/warn write to stderr

install.sh

@@ -23,9 +23,9 @@ RED='\033[0;31m'
 CYAN='\033[0;36m'
 NC='\033[0m'
 
-info()  { echo -e "${BLUE}[INFO]${NC} $*"; }
-ok()    { echo -e "${GREEN}[OK]${NC} $*"; }
-warn()  { echo -e "${YELLOW}[WARN]${NC} $*"; }
+info()  { echo -e "${BLUE}[INFO]${NC} $*" >&2; }
+ok()    { echo -e "${GREEN}[OK]${NC} $*" >&2; }
+warn()  { echo -e "${YELLOW}[WARN]${NC} $*" >&2; }
 err()   { echo -e "${RED}[ERR]${NC} $*" >&2; exit 1; }
 banner() {
     echo -e "${CYAN}"