Renames the module's own claim the-controller -> mesh-controller (the seat is the server, ADR 0079), and adds TestAFoundationModuleCannotBeRaisedOnASecondNode asserting each foundation module's second assignment is refused with 'one per mesh'. Closes hq issue 056. https://claude.ai/code/session_01D6qtiYU3P9jk3pnAXyAFyx