fix(mux): consume export gaps and ends in read order

quest/m1/README.md

@@ -143,7 +143,6 @@ above them.
 - [JS request deadline](/quest/m1/js-request-deadline.md) - each JS request, PUBLISH_NAMESPACE included, has one fatal 10 s timer from create to answer and fails fast without stream credit, so nothing queues or retries
 - [Handshake deadline covers admission](/quest/m1/handshake-admission-deadline.md) - `listen.timeout` bounds a connection through auth admission on both listeners, replacing the hardcoded admission timeout
 - [Container reads drop backfill](/quest/m1/read-backfill.md) - the JS container consumer drops groups below its read cursor like Rust
-- [ExportSource reads Read items](/quest/m1/export-source-read.md) - exporters learn of gaps and ends from the read stream, and the private counters go
 - [Rust request credit](/quest/m1/rs-request-credit.md) - a moq-net request fails at once without stream credit instead of waiting
 - [qmux no-wait opens](/quest/m1/qmux-no-wait.md) - @moq/qmux rejects an over-limit create when waitUntilAvailable is false, like Chrome
 - [#933](/quest/m1/933-video-rotation-metadata-not-propagated-from-mobile-camera.md) - the catalog rotation follows the live camera's orientation