nx_friend_video_caller_test.nx

nx_friend_video_caller_test.nx -- KAT for nx_friend envelopes + JSON-type extractor. Live-network behaviour (dance against the production nx_signaling daemon) is covered by the deploy bench at bench/ops/nx_friend_video_caller_deploy.sh -- this file verifies the bits-up offline-checkable invariants. Covers: T1 hello envelope length > 0 and parses to kind=1 T2 offer envelope length > 0 and parses to kind=2 T3 answer envelope length > 0 and parses to kind=3 T4 ice envelope length > 0 and parses to kind=4 T5 envelope-type extractor returns 0 on malformed payload T6 envelope-type extractor tolerates whitespace around the colon T7 sealed-enum verdict-range check T8 IPv4 sockaddr_in builder writes the correct byte layout expect_exit: 0 license_tier: ORIGINAL