refactor: split empty data frame count from budget - #945
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Problem HTTP/2 flow control limits DATA payload bytes, but not the framing overhead from excessive numbers of small frames. A peer could fragment data into many tiny frames, causing disproportionate memory usage from queued events while remaining within flow-control windows. Solution Backport the framing overhead budget and empty frame handling from master (hyperium#935, hyperium#940, hyperium#942, hyperium#945, hyperium#946) to the 0.3.x maintenance branch. Validation Ran the full test suite and added regression integration tests in stream_states.rs.
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cc #944