signalling: add compression envelopes for signal messages - #1746

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Commits on Aug 28, 2026

signalling: add compression envelopes for signal messages

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signalling: share one compression type across both envelopes

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signalling: negotiate compression with a first frame, not a response flag

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signalling: carry compression as a oneof arm, not an envelope

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signalling: let the server announce that it can decode compressed requests

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