If the Mechanic is freed in teh dungeon, and then subsequently killed before you have a chance to properly assign her housing, what happens to her? Does she respawn in housing, respawn somewhere free, or...?
No, if the mechanic dies before you have a house for her, as long as you have a house for her, she'll take the house. But if she dies before moving in, she won't have to be untied again. same for the goblin tinkerer and wizard.
I found the Goblin Tinkerer (who moved in when I had the correct housing) and the Mechanic near each other, i went to continue exploring and the Mechanic died somehow, I didn't have a house at the time for either, do I wait or what?
well you know what really sucks. was going down the dungeon and saw her on the bottom of my screen as I was making my way down and then -choking of death- sound happened and she was dead! I didn't get anywhere near her and she died