Bound streamed exec-server HTTP response bodies - #32112
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## Why Frame-count backpressure does not bound the amount of executor-controlled data retained in streamed HTTP response queues, and a single body delta could exceed the intended wire size. ## What changed - Limit each decoded `http/request/bodyDelta` payload to 1 MiB, split locally produced response chunks at that boundary, and reject oversized incoming deltas. - Apply a shared 16 MiB byte budget across queued HTTP response streams. Release capacity as deltas are consumed and fail a stream when the budget is exhausted. ## Testing Added coverage for rejecting an oversized delta and for failing a stream after its queued deltas exhaust the shared byte budget. GitOrigin-RevId: be9205fef44b0ec96b84b31a8e059b1cb9cd3f3b
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Bound streamed exec-server HTTP response bodies
Why
Frame-count backpressure does not bound the amount of executor-controlled data
retained in streamed HTTP response queues, and a single body delta could exceed
the intended wire size.
What changed
http/request/bodyDeltapayload to 1 MiB, split locallyproduced response chunks at that boundary, and reject oversized incoming
deltas.
capacity as deltas are consumed and fail a stream when the budget is
exhausted.
Testing
Added coverage for rejecting an oversized delta and for failing a stream after
its queued deltas exhaust the shared byte budget.