Is attending (and presenting at) a summit taken as an "honor'' in a CV elevating the chance for tenure-track applications? I've been selected by my school and an external committee to attend this-year version of this summit. As far as I've been informed up to now, the agenda is attending a bunch of interviews with both scientists and non-scientists to broadcast my research (panelists are supposed to be some Nobel Laureates).
To me, the only potential motivation to attend it would be the case based on which such attendance will be considered as an honor in my CV (something similar to, or even more significant than, what a "best paper award in X conference" does bring to mind). Namely by honor, I literally mean whatever may make my CV fancier than before to entice typical admission committees assessing assistant professorship applications. Additionally, I have to pay half of the commutation cost which is a great repulsive factor if this summit really wouldn't make any sensible impact on my future chance to hunt a tenure-track position.

All in all, would a "presenter at summit X" add anything big to my CV (considering I've some scholarships, an IEEE thesis title, a best paper award, etc.)?
I think this strongly depends on the field. 

In pure mathematics, I think nobody would be the slightest impressed by "represented my university in the future research leader summit, which managed to heap 25 nobel laureates into a big pile". It might even have a slightly silly and vain vibe (whereas everyone would be ecstatic about an invited talk at the ICM). 

But this could be completely different in other fields; so I think your best guess is to trust the opinions and reactions of the (senior) colleagues in your field.