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My opponent has attacked me, and I reveal the Secret Action Bolster. I use Bolster to attach a Multi-Mission Gear to a Specialist. I then use the Action granted by Multi-Mission Gear to play All-Out Attack. World implodes, right?

Your characters can never attack on your opponents turn, even if a card seems to say otherwise. Same rules apply even in the event of a galactic implosion and resulting gravitational chaos.
Source: Wizards of the Coast (2019-07-29)    【Link to Ruling】
Tags: All-Out Attack, All-Out Attack, All-Out Attack