At a certain client, was asked to help them with an "intermediary" solution to stopgap a license renewal on their HR recruiting system.

This is something I was very familiar with, so no big. Did some requirements gathering, told them we could knock it out in 6 weeks.

We start the project, no problems, everything is fine until about 2.5 weeks in. At this point, someone demands that we engage with the testing team early. It grates a little as this client had the typical Indian outsourcing mega-corp pointey-clickey shit show "testing" (automation? Did you mean '10 additional testers?') you get at companies who put business people in charge of technology, but I couldn't really argue with it.

So we're progressing along and the project manager decides now is a great time to bugger the fuck off to India for 3 months, so she's totally gone. This is the point it goes off the rails. Without a PM to control the scope, the "lead tester," we'll call her Shrilldesi, proceeds to sit in a room and start trying to control the design of the system. Rather than testing anything in the specification, she just looked at the existing full HRIS recruiting system they were using and starts submitting bugs for missing features. The fuckwit serfs they'd assigned from HR to oversee this process just allowed it to happen totally losing focus on the fact this was an interim solution to hold them over for 6 months and avoid a contract renewal.

I get real passive aggressive at this point and refuse to deliver anything outside the original scope. We negotiate and end up with about 150% scope bloat and a now untenable timeline that we delivered about 2 weeks late, but in the end that absolute whore made my life a living hell for the duration of the project. She then got the recognition at the project release for her "excellent work," no mention of the people who actually did the work.

Tl;Dr people suck and if you value your sanity, you'll avoid companies that say things like, "we're not in the technology business" as an excuse to have shitty, ignorant staff.

This is a ways out because I can't find LED filaments thin enough to simulate this, but if/when I find them, how difficult would it be to program a controller to have them map my circulatory system, with them pulsing in time to my pulse? I want to do something cool with my arm, and this keeps coming into my head, but I'm freaking out over how difficult I'm thinking this is going to be.

Ideas? Either on how to do this, or what else I can (reasonably) do? Friends irl want a rocket punch, I want a flamethrower, but anything else?

I'll give you a few reasons to walk away from a dev's chair:

1. if you want your life to be simple and not challenging, if you just want to go with the flow - choose something else. Dev's life will definitely bring some challenges to your day (and sometimes night, and sometimes - your weekends). Especially if you feel you are a perfectionist, dev life could turn your life into a living hell if not handled with care.

2. If you like to see people smiling, if you love that feeling when you help someone and that someone has a better day thanks to you - choose something else. 1st line SD would probably do, but the further from technology you go - the more smiles (and human faces overall) you'll see.

3. If you prefer person-to-person interaction over to talking to machines - definitely don't be a dev. Go to management, administration or smth else, but development. >90% of the human interaction in this field is arguments and conflicts; ~8% are requests for assistance, and the remaining 2% are shared by saying "hi" to the office administrator and your (semi|)annual reviews with your manager. Not kidding.

4. If you have a personality where you find it difficult to stand your ground and not budge to the pressure/blame game/your managers asking you to stay in late. Like it or not, it happens quite often. Many devs have spoiled the management by budging to their requests/demands to stay for OT/unpaid OT to "fix the mess they have made". That's a blame game right there. And these people stay in and do what the slaves do - work for free because they are yelled at. And then management sees this technique work and (ab|)uses it on other devs. If you can say NO and stick to it, prolly wave with some printed paragraphs of labour law in front that manager's nose - it won't be a problem. But if your consciousness is too troubling - stay away from this field of engineering.

5. If you want to easily "disconnect" from work and go do something else - dev's career might be a problem. Yes, your computer might be shut down/hibernated/suspended after 5pm until 9m the next morning, but your brain will most likely keep trying to solve the problems you were facing. You'll prolly use your own computer to do some research, check some forums, docs, etc. - this is all your free time, this is all your family time donated to your manager (and to your personal knowledge base). Not to mention, all these things you learn will soon enough become obsolete, as new technologies will replace them. So if you'd like to easily "disconnect" after 5pm, doing that as a dev might be too challenging.