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3b6914b1b2
move the egl detile and rgba pack out of the root --service and into the unprivileged --server. the root now calls only drmtap_open + drmtap_grab_desc and exports a raw dma-buf fd; the fd rides the _drm channel over SCM_RIGHTS with a small descriptor (geometry, per-plane offsets/pitches, modifier, hdr) instead of the full rgba frame, dropping the per-frame copy. the --server imports the fd with drmtap_open_render + drmtap_convert_dmabuf, keyed by the import-once egl cache, and the render context is created and dropped on the recv thread. the _drm transport moves off Framed<BytesCodec> (which cannot carry a fd) to a bespoke sendmsg/recvmsg framing (DrmConn) that attaches one SCM_RIGHTS cmsg only when a fd is present and rejects a truncated ancillary message. the split symbols are bound optionally so an older libdrmtap still loads the cpu path, and the whole thing degrades to the cpu BGRA path or PipeWire when no render node is available. pins libdrmtap-sys to =0.4.13 with the Cargo.lock checksum. folds in the DP-MST, ldconfig-restart and per-display PipeWire-fallback review fixes and a udev hotplug refresh.