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session.Config used to spread 16 per-transport tuning fields across its top level (VideoWidth/Height/.../VP8FPS/.../SEIAckTimeoutMS). The flat layout meant every caller had to know which fields belong to which transport, and the YAML→session bridge in internal/config repeated the same name 32 times across Apply/ApplyProfile. Group them under VideoConfig/VP8Config/SEIConfig structs hung off session.Config. internal/config now does e.g. dst.Video.Width = pickInt(dst.Video.Width, f.Video.Width) instead of touching dst.VideoWidth. session.ApplyTransportDefaults, validateVideoChannel/VP8Channel/SEIChannel and buildTransportOptions read through cfg.Video.*/cfg.VP8.*/cfg.SEI.* in the same way. The YAML schema itself was already grouped (Video / VP8 / SEI sections); this commit lines session.Config up with it so the Apply functions can mirror the YAML structure 1:1 instead of unpacking it into 32 flat assignments. All session/config/e2e/cmd/main tests that referenced cfg.VideoX directly are updated to cfg.Video.X. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>