Give AI shells a magtractor

[misto]

have the magtractor not be any kind of default tool module but an arm that must be built and put on the bot chassis by a human at some point. voila, now the roboticist has a job of putting on at least 1 magtractor arm before the self modifying, self replicating cyborg menace overruns us all

or more likely the borgs will run off to do shit with their new hands and crawl home begging for replacements when their limbs get shot off