Cleric:
Investiture strikes me as a little uneven. Several subclasses already get martial weapons and even more get heavy armor, so these classes are disincentivized to pick Martial Training, which is a bit weird, since to the extent that these subclasses are the most likely to make weapon attacks, they get the most out of the rest of the feature (though I guess anybody can bless a weapon for someone else). I think heavy armor alone is probably worth more than the skill/tool/language proficiencies granted by Scholastic Training.
The blessed weapon feels pretty balanced with the +1 to saves: the weapon is likely to be used more early on, but once most people have other magic weapons, it loses utility, whereas the +1 to saves will be used less often but never goes out of style.
I might just remove the weapon and armor proficiencies from Martial Training, rename the feature, and give both choices a skill proficiency from a tailored list: the "combat" one gets their choice of Athletics, Intimidation, or Persuasion, say, along with proficiency in a suitable tool; the "scholar" one gets their choice of Arcana, History, Nature, or Religion, along with a language.
Ward of Faith: I like this ability, though it is the same thing that Light Clerics get. I guess now Light Clerics get double the uses?
Watched Over: The advantage on saving throw aspect is nice, and makes sense for a cleric, though the wording is ambiguous: is it one roll, or all rolls for one ability? I assume the latter. Commune is already a ritual though, so giving one free casting per day is pretty minor: it saves a prep slot and 10 minutes, I guess; but Clerics have a lot of prep slots, and how often will 10 minutes matter when you're asking your god three questions?
I would suggest splitting this into two features, one at 6th and one at 8th. At 6th, give the "advantage on one saving throw" aspect. At 8th replace the Commune casting either with either a non-ritual spell (your choice of Legend Lore or Scrying, maybe?), or maybe give an intermediate scaling of Divine Intervention.