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* s3: invalidate stale reader cache locations on chunk read failure * filer: share the chunk-read self-heal across reader cache and streaming paths The reader cache retry added a third copy of the invalidate-relookup-compare-retry dance already inlined in PrepareStreamContentWithThrottler and duplicated in retryWithCacheInvalidation. Extract retryFetchWithFreshLocations and route all three through it, parameterized by the refetch primitive. * filer: drop redundant completedTimeNew store in reader cache success path startCaching already stamps completedTimeNew unconditionally before the fetchErr branch; the second store inside the success branch is dead. * filer: make NewReaderCache cache invalidator an explicit parameter The variadic ...CacheInvalidator only ever read the first element, so a caller could pass two and silently get one. Take a single explicit argument and have the non-S3 callers pass nil. * filer: inject reader cache chunk fetch as a struct field Replace the process-global readerCacheFetchChunkData test seam with a per-instance fetchChunkDataFn field defaulted in NewReaderCache, matching how lookupFileIdFn is already wired. Tests set the field on the cache instead of swapping a shared global. * filer: log the location count, not full URLs, on self-heal retry --------- Co-authored-by: Chris Lu <chris.lu@gmail.com>