This is thematically interesting, but I have a few concerns.
- Saving throw proficiencies are Con and Wis, two common saves
- It's really weird to have NO weapon proficiencies in a class. I mean even a Wizard can bonk people with a stick in a tight spot. I'm not sure why this decision was made.
- The Reconnaisanse feature gained at 5th level is similar to features from Masterminds and Battle Masters, but works as a bonus action and comes in ealier in the level progression. Yes, you need to pass a check to use it, but it's a Perception check on a Wis-based class with Perception in the class skill list, and one of the archetypes gives you expertise in it too.
- Main thing - the monkeying with concentration. I am deeply unsure of how that would work, especially in the hands of optimizers, especially with Con saves being proficient for the class. All in all, being able to concentrate on two spells and then also cast non-concentration spells seems like waaay too much arcane power for one wee little spellcaster.
With the archetypes, the Home archetype seems somewhat out of place to me. I understand it's supposed to be a spy-ish charming archetype, but it doesn't seem like it would work well with the rest of the class features.
All in all, if a player came to my table asking to play this class, I would have to think reeeeeal long and hard about it. And prepare a nerf hammer.