So the question is about what the Forge can deconstruct for a chance to have the enchantment stored for future use, and what represents an enchantment. We see from the weapon schematic that more complex weapons will have additional bonuses associated with it. Can those bonuses be claimed by the Magic Smithy and converted into an enchantment? or does it have to have been an enchantment to begin with. We know Richter can convert spells into enchantment, so why not non-enspelled bonuses?
The thing is, what limitation you place on the Magic Smithy, would also have to be placed on the Magic (Craftery?).
I'd say it has to be an enchantment to begin with. Or these enchantment must carry a greater cost than would be normal for an enchantment of that powerlevel. Otherwise Richter could sacrifice a bow made from the wood of the quickening - a special branch bestowed upon the glorious lord of the village for bringing back the pixies after they commune for the first time, or some other scenario - and everyone would be able to get the gifts because Richter threw it on the forge. It would be OP, every special material would get its properties turned into enchantments. Also, enchantments are magical constructs. The forge copies that construct.
Not sure how the Cauldron is comparable. It is not converting a bonus to an Enchantment at all, whereas a crafting table probably would do the same thing, just for Items instead of Arms and Armour.
I suspect that it's only actual Enchantments, at least at the Moment. As the FoH Levels I believe that it May be able to mimic as Enchantments the effects - Traits created by Auspicious Times, Specific Bonus and Powers (although as a weakened versions), and also possibly in time the Traits placed by other Magic Forges? Certain Researches might help with this as well?
If like to see Richter Deconstruct an Enchanted Item with his own Deconstruct Talent, just to see how it works and what he might get from it. Might be something he could try when he's in the Depths and he finds something he can't take with him but doesn't want to leave behind for enemies to use? Or even just if he finds another Ring of add one Health, Mana, Stamina, ect, Point then Deconstructing it might be worth it just to see what happens.
My point is that there is no reason a Craftery has to follow the same formula as the FoH, and that we have already seen very different abilities between the two core buildings we already have. I would be very disapointed if a Craftery was just a copy and paste version of a core forge. I would expect a set of abilities that are as different from the FoH as the Caudron is.
Deconstructing an Enchanted Item would be a useful way of Destroying a Magic Item if either he considers it to Unpleasant/Evil to exist, to dangerous to leave behind it he can't take it with him or just to mess with the owner of he can't steal it.