Document why wrapping QuinnTransport with EncryptingTransport using the
pairwise client↔relay key cannot work for an SFU (recipient has a different
key than sender). Propose two valid paths: MLS group keys (true E2E) or
hop-by-hop relay re-encryption (relay-trusted). Recommend hop-by-hop first.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Blockers 4 & 5: browser getUserMedia → JPEG IPC → Rust I420 pipeline;
remote video strip renders decoded frames via canvas; EncryptingTransport
wraps QuinnTransport so WZP AEAD is applied to all media (C2 fix).
Test fixes: HandshakeResult.session destructuring across relay/client/crypto
integration tests; video_codecs field added to all CallOffer/CallAnswer
structs; wzp-video pipeline_roundtrip integration tests added.
PRD docs: five Kimi-ready specs for E2E encryption, Android NDK 0.9 migration,
quality upgrade flow, wire-format hardening, and clippy debt.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
