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Autocomplete on TraversalProgress was suggesting *way* too many things.
It's now reigned in.

Being able to say `tp.Ctx` is gone, but that's a small price to pay.
(And perhaps we should actually move the Context up to TP?  Wouldn't
seem unreasonable.  I think the main reason it's in TC right now is
to reduce the size of memory that's shuffled when TP is passed by value
down the stack, and it's unclear how consequential that's really
going to be in the big picture.  We can review this later.)
Signed-off-by: Eric Myhre <hash@exultant.us>