Incomplete: Making the top level concurrent. Updated the trampoline so the definitions of a tick were all-or-nothing and to properly enforce `assert-current-modality`.
Incomplete: Making the top level concurrent. Updated the trampoline so the definitions of a tick were all-or-nothing and to properly enforce `assert-current-modality`.

rocketnia/era-cene,era-platform/cene,rocketnia/era-cene,era-platform/cene,era-platform/cene,rocketnia/era-cene