No. They all require non-magical weapons and make their weapons magical. As soon as you do one to a weapon, the weapon becomes ineligible for the bonus provided by the others.
Magic weapon says the weapon "becmes a magic weapon" so can not be used by the other features
Blessing of the forge "imbues magic into the weapon" so a sword thus blessed is now magical and can not be used by the other features
The improved pact weapon does not say the weapon becomes magical but
Casting "magic sword" or performing blessing of the forge on an improved pact weapon has no effect (unless it is cast at 4th level or higher) beacuse it turns the weapon into a +1 weapon which is already is
Blessing of the Forge "grants a +1 bonus" to attack and damage rolls. Which RAW could be interpreted as either a +1 from the base attack roll or a +1 to what it was. You can argue gramatically it is not clear but RAI is clear that they shouldn't.
Worth noting Improved Pact Weapon can only affect a Pact of the Blade pact weapon. Per the Pact of the Blade feature the weapon is either a magic weapon you turn into a pact weapon via a ritual or it is a weapon you have conjured out of thin air.
If conjured out of thin air the pact weapon counts as a magical weapon for the purpose of overcoming damage resistance. While not explicitly RAW, it is not much of a stretch for a DM to rule that an improved pact weapon counts as a magical weapon for the purposes of Magic Weapon or Blessing of the Forge.
Magic weapon says the weapon "becmes a magic weapon" so can not be used by the other features
Blessing of the forge "imbues magic into the weapon" so a sword thus blessed is now magical and can not be used by the other features
The improved pact weapon does not say the weapon becomes magical but
Casting "magic sword" or performing blessing of the forge on an improved pact weapon has no effect (unless it is cast at 4th level or higher) beacuse it turns the weapon into a +1 weapon which is already is
Blessing of the Forge "grants a +1 bonus" to attack and damage rolls. Which RAW could be interpreted as either a +1 from the base attack roll or a +1 to what it was. You can argue gramatically it is not clear but RAI is clear that they shouldn't.
Remember "If it looks like a duck it probably isn't" - Sage Advice Compendium. GO THROUGH THAT
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I'm sure this has been asked elsewhere, but i can't find it.
All three of these capabilities:
1) Magic Weapon (spell)
2) "Blessing of the Forge" (Forge Domain Cleric Feature)
3) "Improved Pact Weapon" (Warlock Invocation)
Essentially do the same thing: They take a non-magical weapon and give it a +1 to-hit and a +1 to damage.
Now the question is, could they stack?
No. They all require non-magical weapons and make their weapons magical. As soon as you do one to a weapon, the weapon becomes ineligible for the bonus provided by the others.
Worth noting Improved Pact Weapon can only affect a Pact of the Blade pact weapon. Per the Pact of the Blade feature the weapon is either a magic weapon you turn into a pact weapon via a ritual or it is a weapon you have conjured out of thin air.
If conjured out of thin air the pact weapon counts as a magical weapon for the purpose of overcoming damage resistance. While not explicitly RAW, it is not much of a stretch for a DM to rule that an improved pact weapon counts as a magical weapon for the purposes of Magic Weapon or Blessing of the Forge.
Remember "If it looks like a duck it probably isn't" - Sage Advice Compendium. GO THROUGH THAT