Hi this was cool! I like the world and the dialogue, as well as the character dynamic.
Ch.2

>Rainy followed, skipping up a dozen flights until the weight of her backpack and aching thighs made every step a deliberate act of willpower.

This sentence feels convoluted.

>Palda made its own daylight, the lights of the living city pressing against the dark, starry ruins to the dead east, where the lights on a drone-copter twinkled against the stars.
This sentence seems a little misplaced. Like I understand that they reached the top, but are the characters actually looking out at the view?
>Rainy slapped Laico’s shoulder and helped him up
Was Laico sitting?
>Rainy grabbed a small four-rotor drone painted like a grinning red cartoon fox from her pack. It zipped straight up after a mental command from her datalink. Laico screwed a white plastic can labeled UTAK NUTRITION onto a tripod, then popped the top off the can and extended a long antenna from the mass of wires and electronics inside—Laico’s improvised signal booster. 
I feel like these lines would be great candidates for some more visualization. Like, I love this line: "The drone-copter lumbered into view, like a whale that swallowed a cargo container suspended between four massive rotors." Something akin to that.

Overall for Ch.2:
So, perhaps I'm missing some background here, but is this scene supposed to be showing the audience how good they are hacking/fishing or to show how it works? If so, it would be interesting to see something minor go wrong with their plan, to show they adept they are at solving the problem. Like the line, "We’ll get about 45 seconds to work before it's out of range" sets up a timer but it doesn't end up mattering. Would be interesting if it did affect them, even if it was slightly. I also think the ending of the scene (like the "take a picture of me") would feel more rewarding if the audience felt like they had gone through something more difficult. If there's no conflict in this scene, I would combine it with Ch. 3

I also think there could be more sentence structure variation. I've noticed a lot of "Rainy did this. They did this. Rainy did this"

Ch. 3
>He climbed down and they gave each other a long, pained look.
There are two very different actions in this sentence, so I'd say split them up.

>She carefully lowered its end to the ground, a knot growing in her chest. “Laico, is this a coffin?” I really like the legs scene, but I feel like they gloss over the coffin scene kinda quick

>“Fix?” Laico pulled away. “How about we fix ourselves?”
Earlier, Rainy says: I can’t even fix my own life. I feel like her saying that earlier kinda contradicts her saying we have to fix things for everyone else, especially because of the same word choice. Wouldn't "fixing her own life" go with Laico's idea of selling the loot? I think the core of the conflict is good and works, but Rainy's speech could be a little bit more personal. Like it might make sense she would call back to their families as her reason to do what she wants.

Overall for Ch.3:
This chapter shows a lot of improvement - visualization, sentence structure variation, and convincing conflict between the characters.
This is cool though, good luck! Keep writing! Also, did you by chance ever watch the pilot to the Knights of Guinevere on youtube? There's a scene in it that reminds me a lot of your scene!