so after i completed the mage guild quest I donned on the reward cloak thing and the mask of maskded maskfulness

now for the glitch doing so enabled all my novice skills like flare froste bite and spark to cost NO manna (the bar wouldnt even show up as I was casting and higher level spells like ice wall and dual clairvoyance would deplete manna) so i was travelign about casting sparks everywhere and was awesome then i quick traveled to a few places still had infinite manna on weaker spells ... then i went to Whiterun and my spells started costing manna again ... so thats why im unsure as to what part is glitch and what part isnt ...

This is I think a sort of reward for finishing the mages guild questline.
After you finish it your magicka will regenerate faster for a couple of hours.

I thought magicka regenration came from the cloak + mask of maskded maskfulness (200% total if it stacks)

Not the superfast regen you get after the questline.
The mages gear and mask are useless anyway as magicka regeneration slows to 30% of normal when in combat for some inexplicable reason.
There is literally no reason not to wear armour.

I want a challenging game not something i can afk button press and complete and if that restricts me from armour so be it

Well, that is one reason

it may be that the robes of the archmage give + 100 magika or something like that.

Same thing happened to me after the quest in Saarthal. For a long time I had instant magicka regeneration, was able to spam runes, summons and every other spell. Was really pretty ridiculous. Then after I quit playing for the day and loaded up a couple days later it was gone. Makes me think it's a glitch as there was nothing in the active affects list to explain it.

Nah, don't think so really, I had the same thing. I checked my active effects and it was a 200+ to magicka. Since regen is based on your magicka, some spells wouldn't deplete it. This way I could kill Krosis and a dragon at the same time, while being lvl 10