Remove node/npm checks from installer

Claude Code's npm install handles these dependencies.

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

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

Author: sssemil

install.sh

@@ -10,17 +10,6 @@ case "$OS" in
   *) echo "error: Linux or macOS required"; exit 1 ;;
 esac
 
-# basic deps
-need() {
-  command -v "$1" >/dev/null 2>&1 || {
-    echo "error: missing dependency: $1"
-    exit 1
-  }
-}
-
-need curl
-need node
-need npm
 
 # paths
 BIN_DIR="$HOME/.local/bin"