chore: remove git source install hint

Author: steipete

public/install.sh

@@ -645,7 +645,6 @@ EOF
         echo -e "Installed from source. To update later, run: ${INFO}clawdbot update --restart${NC}"
         echo -e "Switch to global install later: ${INFO}curl -fsSL https://clawd.bot/install.sh | bash -s -- --install-method npm${NC}"
     elif [[ "$INSTALL_METHOD" == "npm" ]]; then
-        echo -e "Source install (GitHub checkout): ${INFO}curl -fsSL https://clawd.bot/install.sh | bash -s -- --install-method git --no-onboard${NC}"
     elif [[ "$is_upgrade" == "true" ]]; then
         echo -e "Upgrade complete. Run ${INFO}clawdbot doctor${NC} to check for additional migrations."
     else