bytes_pending was an opaque aggregate of NonTried + NonTrimmed +
NonScraped. UIs that wanted a "will retry in Pass 2-N" bucket were
stuck showing the entire unread disc as Maybe at pct=0.
Adds two granular fields to MapStats:
bytes_nontried — Pass 1 hasn't read these yet
bytes_retryable — NonTrimmed + NonScraped, Pass 2-N will retry
bytes_pending stays for back-compat (= bytes_nontried + bytes_retryable).
Also picks up the cargo fmt --check lint that's been red on main CI
since v0.13.18 (rustfmt fold differences on a few long format-string
layouts; functional no-op).
MattJackson
ae76aaf0fa