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The listing pipeline signalled "this page exhausted the namespace" by
setting `MetaCacheEntriesSortedResult.err = Some(Error::Unexpected)` and
had every consumer filter that variant, so any future `Unexpected` on the
producer path would have been read as a complete listing. A second truth
source, the shared `producer_limit_reached` atomic, was last-writer-wins
across the disks of a page and was never serialized to remote peers.
Collectors now return `ListPage { entries, exhausted }`, errors surface as
errors, and the early empty-listing exits return an exhausted empty page.
The producer's stop reason travels in the metacache stream itself:
`MetacacheWriter::close_with_limit_reached` appends it after the `false`
terminator as repeated terminator markers (the only trailing bytes a
deployed reader tolerates, because `list_path_raw_inner` keeps polling
readers after EOF), `MetacacheReader::limit_reached` decodes it, and
`list_path_raw_inner` folds every reader's trailer into a
`ListPathRawOutcome` that reaches the collector. Remote disks therefore
report their per-disk limit stops as well, and the `producer_limit_reached`
fields on `WalkDirOptions`, `ListPathRawOptions` and `ListPathOptions` are
removed.