One thing to definitely keep in mind about the social stigma trait is that if you play it up too hard it can definitely turn into not-fun for the targeted player very quickly. And what "too hard" is will probably vary from player to player, although if they're picking the character knowing what the trait entails then presumably they have at least a little tolerance for it. It is certainly a thing that should vary from place to place and person to person though, both for the sake of realism and so that the player is not constantly bombarded with it. Though another thing to keep in mind, if you do try to play it up, is that the average person probably cannot tell the difference between a NAI (Narrow AI, like a videogame NPC) and an AGI at a glance. Someone or something would have to tell them. Which means if you do go into a particularly anti-AGI place like Luna, the AGI character can dodge a lot of flak by passing themselves off as a rather clever NAI, as long as they don't get examined too closely. Of course, then they get to experience the entirely different (but much less hostile) discrimination of being considered property.

1. By default, an AGI sleeved in an exalt isn't going to look any different than an normal human. Their integration tests might yield worse results than a normal human, but many people can have hard times resleeving. Nothing too unusual. You will need more specific information to single them out. Also, by darkcast, you also mean they have a good cover identity too? If not, anyone could look up that they are an AGI. 2. That would be a problem. Mind you, humans that have been an infomorph running in an accelerated environment would be out of touch too. Many indentured people have lived that. Mind you, a human would likely know what words such as "red-light district" might mean and wouldn't likely to forget after a few subjective decades. An AGI could possibly have never heard of the word. They could have literally be born yesterday (software activated yesterday to be more precise). 3. It varies. Inner systems like the stigma they can impose on uplifts and the clanking masses, and the stigma they can put on AGIs is just as good. The outer systems often strongly frown upon such tribal behavior and are usually quite welcoming. There are habs where they are solely owned by AGIs, uplifts, and people with strong ideological beliefs. Their habs reflect that. If you have the money, resources, military might, and/or the skills, you can make just about anything you want. In many ways, open space is like the wild west, open to anyone who can make a claim.

Interestingly, in Transhuman they get into some of the details of AGI origins and processes in EP, and they get a little neurosciencey (and perhaps a bit less computer sciencey) on us. You could give that a skim, see if you want to use that material for your game or make your own way a bit. So it goes: In creating the first digitized consciences which approached the sweetspot that AGIs are supposed to hit, "a person, digitized," they had real problems constructing something that would pass as comparable/analogous to a sentient human by merely trying to replicate processes purely involving intelligence and cognition, in the sense of what we'd think of as higher-order mental functions. In our own brains, all that is very difficult to extricate from the bits that let us know where our legs and organs are, and how they're doing, and so on- our endocrine, cardiopulmonary and musculoskeletal systems being mentioned as particularly important (along with brain structures whose functions weren't even known, but whose absence would somehow result in deficiencies or just some missing je-ne-sais-quois)- possibly because (IIRC) all these pieces kinda evolved together. In general, our mind/sense of consciousness isn't a single voice issuing commands, at least in a biological sense. It's more like a federation, whose inputs all add up (not always equally) to form what we feel and experience. ...Harder to program than just "if [see/smell/touch] flower, then [beauty/nature/beautiful nature of life/food for bees/pollen allergies]." At least many of the first AGI had to be brought to the point where they were literally simulating an entire human neural system, or at least a lot of one, and given appropriately analogous processes (called "agents") to experience the feedback they'd receive in, quote, "the incorporeal reality of infolife." They even have to be freakin reared, as in educated for their "minds" to form proper. (Not sure whether parental love and interaction was also mentioned to be a requirement/huuuuuuuuge help, as is the case for humans.) (Hmmm... note to self...) And of course those meatbrain structures, while not always of particularly obvious direct application to an infomorph, do a lot to help (or might've even been essential to enabling) the process of sleeving these sentiences into physical bodies, especially biomorphs. I imagine it helps them share simulspaces, too. Some (or perhaps just one, which had many digital descendants) self-uplifting AGI are also mentioned, as in technically "seed AI" in a self-improvement/learning sense (albeit closer in results to uplift transhumans than TITANs), but they kinda make my layman head hurt thinking about them in this neuro-cog-sci context, and I'm not sure where they fit in. Also, I'm not sure how it all works as software, but I believe there's a section on that in there, too. But that can wait this post is long enough already damnit Infolife do still have to adjust to being in a physical body and vice versa for even more reasons (the entire digestive system experience, locomotion in general, and of course social interaction), but all this is to say that, all things equal, it may be profoundly difficult to tell an AGI from anybody else by any casual glance, other than by way of kinesics and general social interaction. (However, infolife do have entirely different common vocabulary for describing things like emotions and their digital "bodies," so to speak- they might say shit like "my flight [response] was high" like we might say "I was scared as hell," for example- so Social Naiveté can be played up pretty dang high even with AGIs who might be relatively worldly otherwise. There are also tons more cultural differences between infolife and sleeved transhumans in there that one can play with, too; even more information transparency, a particular sort of drive to make oneself useful that could be interpreted as an even more particular sort of deathly fear of having near-literally nothing to do, and so on.) No reason you can't have them be less literally human in mental architecture in your game, though.

You really should read Panopticon. A lot of the questions you are asking is how a person can deceive an all seeing system. A system where there are cameras everywhere, you every action logged, including mesh searches, and limited AIs programs wander about trying to organize things. Panopticon is all about that. A. They probably would need a fake identity. If they use their real identity, it is likely that information about you would exist on local servers. Or not. While its been 10 years after the fall, not every habitat has agreed on data sharing standards. Some aren't even friendly enough with each other to even consider that. B. There is hardware that could do a brain scan of you. It is kinda like an ego bridge. It creates a brain map of you that reflects your unique way of thinking (the finger print of the modern age). It is often used to give your nanotat ID a unique ID (read the book). If they feel the need to double check your identity, they could use that kinda technology. Not only that, it will also tell them that you are an AGI instead of human. C. Luna is fairly bio-chauvinistic. They treat people in biomorphs as higher class citizens, let the lower class infugees to inhabit low quality synthmorphs, they seem to make an effort to prevent people from raising their position, etc. They probably wouldn't be very happy to find you. You probably wouldn't enjoy full rights as a person. If you are lucky enough to be caught by someone from the Steel Liberators movement (read sunward for more info on them), they might help you instead, but they are more pro synthmorphs than pro AGI. You might want to consider trying to pass yourself off as someone's muse. Get a friend and have him let you hang out in their mesh inserts. People will ask less questions, and you will be able to spend credits without need to conceal that you are an artificial intelligence.

A technique used by characters in Charles Stross' Accelerando was to create or bribe an off-station corporation which the AGI is legally made the property of; usually with the corporation owned by the same AGI under another ID. LLA polities canonically vary from uncomfortable to delete-on-discovery for AGIs, but destroying a corporation's property might give lawkeepers pause. They have to check up that the AGI is not doing legal business or is carrying proprietary information for that corporation before they continue to avoid lawsuits. Obviously outright crimes would void some of these protections, but its something. Plus this way you get to play with themes of personal ownership and corporate slavery! Win-win. :D

AGI forking and resleeving works exactly the same as other things. 1: All infomorphs can fork onto a new device, or move to it by cutting and pasting themselves. Alienation and Integration work as normal. 2: Two devices, some kind of connection between them. Depends on the limitations of the devices in question. 3: The service alpha fork wouldn't require an eidolon, it could use a basic infomorph freely. An eidolon would probably be a good idea long-term though. They'd need a device to do the merge on, once they have all the ego files. I think an ecto would be enough. 4: Access jacks would only be required if the server won't accept wireless signals. 5: Depends on the exact nature of the alpha I'd say. I can imagine most people would tire of it pretty quickly.

The great thing about cyberbrains is that regardless of the ego's origin (born in flesh or coded into existence, 'humans' and uplifts versus AGI), cyberbrains and the servers that house infomorphs allow egos to copy and paste themselves and move from device-to-device as easily as any other file, presuming a certain minimum latency of connection. On the mesh, an infomorph could hop from ghostrider module to ghostrider module, or just copy themselves a dozen times on such devices. Real crazy stuff.