What a view is matched against: the dataset’s location and table. Stdin’s - fits
no path criterion, so piped data and handed frames match by columns alone.
The saved views, read on a worker from run’s start (a directory parse that can
stall on slow mounts). Nothing needs them until a schema is known (--view,
auto-apply) or the list opens; first use waits if still reading, so a requested view
is never skipped. Derefs to the ViewManager.
Whether the view’s path pattern fits file_path, as opened or as the save form
spells it (relative or linked paths still sit under the resolved directory).