Reconciling with #85 (FFmpeg is gone from the client). Two of my claims were true against the pre-merge tree and false against this one. Note 4 said the desktop clients need no 4:4:4 decode probe "because every rung can display full chroma — swscale converts for the software rung". There is no swscale any more. The CPU floor is openh264 + rav1d, it is 4:2:0 8-bit by contract and has no HEVC at all, so it refuses a 4:4:4 stream rather than converting one. The client still advertises the bit unprobed, which was the point of the original fix, but the honest reason is different: full chroma is a hardware path (Vulkan RExt, NVIDIA today), and what catches a box whose hardware 4:4:4 fails is note 2's codec reconnect, not a downgraded picture. Note 13 repeated the same wrong premise and now names both halves of its warning. The C ABI is 17, not the 14 I read before the merge. Textual side of the conflict: #85 rewrote the Codecs column and notes 1-3 of the same table while leaving note 4's stale 4:4:4 text alone. Theirs kept in full; only the 4:4:4 column and note 4 are mine.