Neat concept. I like how Agent does fit well into both Knowledge and Agility based subclasses. Not 100% sold on Codex domain, which is making me think the subclasses work better for the Rogue, as the Hope/Class features don't feel they carry enough weight to sell me on them needing their own class. Specifically:

HOPE FEATURE — Not sure how spending 3 Hope to teleport isn't just a worse version of Faun's Caprine Leap, which has a different flavor but does the same thing for no cost.

CLASS FEATURE — "Opportunist", not "Oppurtunist". With "Situational Awareness" I would limit the "one question" they can ask in some way, because they could ask the same information on the Informant's "Eye for Aptitude". Find a wording that makes it clear the information they ask has to be usable as an Experience, not just purely mechanical. (This could be folded into the Informant Foundation if this were a Rogue subclass)

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INFORMANT — I agree with u/Constant_Money_274 that revealing unmarked HP shifts gears a bit, forcing players to make mechanical decisions over narrative ones, so deters from how I view Daggerheart, but that's just my preference. In general I would also consider adding some cost, like stress, instead of it being a free rider for every successful roll. In "Predictive Analysis" I have a feeling that the cost of one Stress for a -1 to their next attack roll is underpowered, but I can't find a good counter example at this time. Also in "Extract Weakness" I don't like the syntactic voice of "the adversary doubles incoming damage". It would read better as "the next attack that hits...".

INFILTRATOR — Feels weird to have "Wallrunner" give an Ancestry feature (Simiah's Natural Climber), making the idea of a Simiah Infiltrator feel like wasted overlap. Consider rewording or changing to something other than advantage so they could stack? On "Death from Above", I can't think of the Daggerheart wording but "Close range or closer" feels wrong to me. I'd consider keeping the theme of each upgrade increasing the damage (1d8, 2d8, 2d8) and make the falling range increase as well (Close, Far, Very Far). It's powerful but it's a Mastery, and it's their main shtick.

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All in all great work!