What files do I send to client ?

Simply generate all the versions and write up a guideline when to use what. You're going to need to produce all the social media banner sizes right away in an ideal scenario, anyway. Companies are notoriously bad at this stuff and then complain when their logos degenerate upon resizing or the colors get screwed by the servers re-compressing the images. Similarly, it seems a stretch even for vector formats to cover so many scenarios. Embroidery and silk screen printing for textiles are going to need colors separated by layers/ ink or spot colors, but at the same time mugs, conventional T-Shirts and even banners can easily be printed based on RGB inkjet stuff. Similar issues may arise when doing print stuff in CMYK and then again even video has certain requirements with compression and all. E.g. your own user icon would be terrrible to compress and cause a ton of artifacts on MP4/ H.264 video due to the contrast and intense red. You see, this isn't going to be a "one and done" thing and in a bad scenario the client is always going to come back to you at the most inconvenient times to fix things for them, so if you really want to be smart, perhaps it would be best to set up a contract to do the work for them if and when needed instead of trying to cover all the bases now and still screw it up...

Mylenium