feat(grpc): Phase 1 — in-house gRPC channel foundation#523

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userFRM wants to merge 9 commits into

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feat/grpc-channel-phase1

Commits on May 13, 2026

feat(grpc): add inhouse-grpc feature flag and empty grpc module
userFRM
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feat(grpc): add length-prefix Codec with wire-format parity tests
userFRM
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feat(grpc): parse gRPC Status from HTTP/2 trailers
userFRM
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docs(grpc): scrub phase vocabulary from module comments
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feat(grpc): wire Channel + ServerStreaming on h2 with mock server tests
userFRM
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feat(grpc): wire stock_list_symbols through the in-house Channel
userFRM
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perf(grpc): add criterion bench comparing in-house Channel to tonic
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chore(grpc): refresh Cargo.lock for criterion async_tokio feature
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docs(grpc): add module-level rustdoc covering wire shape and layout
userFRM
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