webrtc: Support FIN/FIN_ACK handshake for substream shutdown#4

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timwu20 wants to merge 21 commits intomasterfrom

tim/support-flags

Commits on Jan 8, 2026

webrtc: Implement proper FIN/FIN_ACK handshake and fix flag handling bug
timwu20
committed

Commits on Jan 9, 2026

webrtc: Unify event variants and encoding to use optional flag parameter
timwu20
committed
webrtc: Implement proper shutdown with FIN/FIN_ACK handshake and wait for acknowledgment
timwu20
committed

Commits on Jan 12, 2026

Commits on Jan 13, 2026

webrtc: Fix data channel closure by detecting substream drop regardless of state
timwu20
committed

Commits on Jan 22, 2026