The Dungeon World 5th-level spell summon monster lists some choices, one of them being a useful adaptation. If the player picks "spell caster" for a useful adaptation, could they end up with an Orc Shaman or possibly a Hedge Wizard?
It wouldn't matter if they did.
And there are two reasons.
First, anything you summon only has access to the basic moves. "A useful adaptation" should be understood in the context of letting your summon use the basic moves in unusual situations, such as carefully searching a lakebed or having a punch-up in the middle of a lava flow. "My summon can do whatever I want it to because it knows magic" is far too broad as a useful adaptation. "My summon can Volley with screaming bolts of blood" or "My summon can Discern Realities in a remote place with farsight", on the other hand, are worth considering.
Second, the DM picks the form of what you summon. It's based on the qualities you pick, true, but there's nothing limiting the DM to only using specific creatures out of the Monsters section of the book. It's heavily hinted at that whatever the Wizard calls up is not going to be of this plane.
No. It's not intended to grant spellcraft.
A useful adaptation like being amphibious or having wings: add a special quality for the adaptation (p224 DW)
It's intended to be a creature feature like a body part or an innate magical ability, not spell casting abilities. They also note being intangible as a possible ability.
It's meant to be a guide to the fiction, not a move.
Special qualities describe innate aspects of the monster that are important to play. These are a guide to the fiction, and therefore the moves. A quality like intangible means just what it says: mundane stuff just passes through it. That means swinging a mundane sword at it isn’t hack and slash, for a start
While spell casting is meant to be a move they possess.
Spells and magic: Magical, write a move about its spells
From the monster creation guide, an aspect that isn't in the summon monster list.
That said, your GM can do as they wish on your table.