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* filer: cancel a chunk download that no reader waits for * filer: stop waiting for reader cache budget once cancelled * filer: keep a cancelled download's re-lookups off its context The refresh and retry lookups took the download's context. FilerClient coalesces concurrent lookups of a volume, so a cancelled download leading one failed the other readers waiting on it. Fetches still stop on cancel. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * filer: test that cancelling a download leaves its re-lookup running Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * filer: cancel unheld downloads when the reader cache is destroyed ReaderCache.destroy waited for every downloader, so closing a reader waited for a stalled prefetch nobody read. Downloads with no reader or stream on them are now cancelled first; ones still in use keep running. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * filer: test that destroying the reader cache cancels an unread prefetch Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * filer: cancel a destroyed download once its last holder leaves destroy skipped downloads a reader or stream still held, and once they were out of the map nothing cancelled them, so destroy waited for a fetch nobody used. removeConsumedLocked now cancels any consumable download, whether or not it is still in the map. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * filer: test a destroyed download cancelled after its last stream leaves Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * filer: release the stream only after destroy dropped the download Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * filer: test a cancelled stream leaving a waiting reader's download running Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>