A feed is read up to 200 MB, not 50 (#357)

The Herd with Colin Cowherd's feed is 62 MB, its whole back catalogue, and had failed every check
since the 50 MB cap of #295 came in on 2026-10-19. The cap was there for an MP3 given as a feed;
200 MB still stops that, at four times the largest real feed seen.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ipx/CHANGELOG.md

@@ -16,6 +16,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Log lines about starting, stopping, accounts and the configuration name the part of iPX that wrote them in `target` (`ipx::daemon`, `ipx::cli`, `ipx::catalogue`, ...), where they all said `ipx` (#356).
 
+### Fixed
+
+- A feed larger than 50 MB is read again, up to 200 MB: a podcast with a long back catalogue had stopped updating (#357).
+
 ## [1.5.0] - 2026-10-23
 
 ### Changed