quest: ship a prebuilt Linux obs-moq bundle

quest/m2/obs-moq-video/README.md

@@ -22,6 +22,7 @@ The quests separate portable decoding, platform GPU delivery, audio, and publish
 - [Audio playback](/quest/m2/obs-moq-video/audio-playback.md) - add synchronized subscribed audio through moq-audio
 - [Windows decoded frames](/quest/m2/obs-moq-video/decode-windows.md) - present decoded D3D11 surfaces in OBS without CPU readback
 - [Linux decoded frames](/quest/m2/obs-moq-video/decode-linux.md) - present supported native decoded surfaces with visible CPU fallback
+- [Linux bundle](/quest/m2/obs-moq-video/linux-bundle.md) - attach a portable Linux x86_64 tarball to every obs-moq release once FFmpeg is gone
 - [Encoder presets](/quest/m2/obs-moq-video/presets.md) - define and measure shared low-latency, balanced, and quality policies
 - [Audio publishing](/quest/m2/obs-moq-video/audio-publish.md) - back an internal OBS Opus encoder with moq-audio
 - [Video publishing](/quest/m2/obs-moq-video/adapter.md) - back an internal OBS video encoder with moq-video and expose the combined opt-in mode

quest/m2/obs-moq-video/linux-bundle.md

@@ -0,0 +1,21 @@
+# [M] Ship a prebuilt Linux obs-moq bundle
+
+## Goal
+
+Every `obs-moq-v*` release attaches a Linux x86_64 tarball that loads into a stock distro's OBS 32+, so Linux users install the plugin the same way macOS and Windows users do instead of building from source. `doc/bin/obs.md` and the moq.pro OBS guide drop their Linux build-from-source recipe.
+
+## Plan
+
+- The only reason `obs-build` in `.github/workflows/libmoq.yml` skips Linux is FFmpeg: the source links nix/distro libavcodec, which is not portable. The FFmpeg removal is the blocker; once the plugin is C++ over libmoq plus libobs and Qt6, a Linux build has no extra runtime dependency that OBS itself does not already carry.
+- Build on `ubuntu-24.04` (glibc 2.39, the floor OBS's own Linux packages target) against the libobs and Qt6 headers OBS's plugin template uses; the template's `.deb` recipe is the reference. Ship the plain archive layout the other platforms use (`obs-moq-*-x86_64-unknown-linux-gnu.tar.gz` with `bin/64bit/obs-moq.so` and `data/`), extractable into `~/.config/obs-studio/plugins/obs-moq/`. A `.deb` is optional and separate.
+- Flatpak OBS cannot load a plugin from the host filesystem. Verify a real Flatpak install and support it only if the sandbox's runtime ABI matches, documenting the `~/.var/app/com.obsproject.Studio/config/obs-studio/plugins/` path. Otherwise, state plainly that Flatpak is unsupported.
+- `cpp/obs/build.sh --target x86_64-unknown-linux-gnu` produces the tarball, and the matrix in `obs-build` gains the row; nothing else in the release pipeline changes. Keep the nightly `just obs ci` compile as the PR gate.
+- Verify by loading the tarball into the oldest supported OBS 32 release and current stable on Ubuntu 24.04 and one non-Debian distro (Fedora), publishing and subscribing against a relay, and inspecting the `.so` with `ldd` for nothing beyond libobs, Qt6, glibc, and OS libraries.
+
+## Required
+
+- [Video source replacement](/quest/m2/obs-moq-video/source.md) - removes the FFmpeg linkage that makes a Linux binary non-portable
+
+## Related
+
+- [Linux decoded frames](/quest/m2/obs-moq-video/decode-linux.md) - native surface delivery lands on top of the portable CPU path this bundle ships