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1fc35f1260
Sliding windows models (e.g. gpt-oss, gemma3) remove tokens that are out of the cache's window each time we start a new forward pass. The cache storage needs to handle the window size for each sequence plus the batch size, since the batch needs to attend to the full window size. This means that we have greater than a window size stored while processing the batch. When the next batch comes, we are currently only looking at the sequences in the incoming batch to slide the window forward. However, we also need to clean up the other sequences that might be occupying space in the batch processing buffer to ensure each sequence is only using its window size of storage. Failure to do this can result in "no kv cache slot found" errors. Fixes: #10127