"skipping their no-op fuel starves nothing" Commit a9260cb, authored with Claude Fable 5, modifies fiber machinery to skip creating or resuming a worker fiber for no-op node callbacks used in scope-effect-only walks, as parked fibers are idle workers and skipping their no-op fuel starves nothing. The change adds 7 lines and deletes 0 lines across 1 file. Commit a9260cb Skip fiber machinery for noop node callbacks Fibers exist solely to let node callbacks ask about types; the noop callback used by scope-effect-only walks does not need one, so do not create or resume a worker fiber for it. Parked fibers are idle workers, not pending work - skipping their no-op fuel starves nothing. Co-Authored-By: Claude Fable 5