Update CI configuration#1
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* Update CI configuration * Remove front build from pull-request
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…rker Both workers allocated a fresh byte[MaxHeaderSize] per stream (16 KB default) to accumulate HEADERS/CONTINUATION fragments before HPACK decode. Allocation sampling showed this was the #1 byte[] allocator across all four throughput benchmark cases (28-48% of bytes, even on the H1 downstream path since upstream is ALPN-negotiated to H2). Route through ArrayPool<byte>.Shared: rent on first fragment (with grow for oversize responses in StreamWorker), return on Dispose. The decoded headers (H2Helper.DecodeAndAllocate, DecodeTrailerFields) produce fresh char buffers and HeaderField lists — no aliasing back to the pooled bytes, so returning at stream end is safe. Regression test H2LargeHeaderTests exercises the grow path (~30 KB response headers across 20 sequential requests) and the fast-path rent/return churn (50 sequential requests) to catch double-return or prefix-copy bugs.
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