quest: split the macOS and Windows app quests

quest/m0/README.md

@@ -79,7 +79,8 @@ repository.
 
 ## Required
 
-- [Studio on macOS and Windows](/quest/m0/app.md) - the studio runs on macOS and Windows, not only Linux
+- [Studio on macOS](/quest/m0/app-macos.md) - the studio runs on macOS, not only Linux
+- [Studio on Windows](/quest/m0/app-windows.md) - the studio runs on Windows, not only Linux
 - [Viewer-side composition](/quest/m0/compose/README.md) - sources as their own tracks plus a layout track, composed by viewers, with a server-composed program as the fallback
 - [Scene editing](/quest/m0/scene-editing.md) - rename and reorder scenes, and resize the canvas while live through a new rendition
 - [Broadcast sources play in sync](/quest/m0/broadcast-sync.md) - subscribed broadcasts and guests play audio and video on the publisher's timestamps, with `moq play`'s delay

quest/m0/app-macos.md

@@ -0,0 +1,21 @@
+# [M] Studio on macOS
+
+## Goal
+
+`moq-studio` is run, not only compiled, on macOS, and whatever only shows up
+there is fixed: camera, display, microphone, and system audio sources, plus
+the window, preview, program, and publish path. Only Linux was built and run
+when the studio landed.
+
+## Plan
+
+- Build with `--features capture`, since a default build has image, color,
+  and broadcast sources only. That build fails on macOS today: the Devices
+  panel's listing task holds moq-video's ScreenCaptureKit listing future,
+  which is not `Send`, across a `runtime.spawn` in `rs/moq-studio/src/ui.rs`.
+  Linux CI never builds it, so `just ci` cannot pass on a Mac until this is
+  fixed. If the fix belongs in moq-video, land it there first.
+
+## Related
+
+- [Hardware validation](https://github.com/moq-dev/moq/blob/main/quest/m3/video-hardware.md) - capture paths not yet run on real machines

quest/m0/app-windows.md

@@ -0,0 +1,20 @@
+# [M] Studio on Windows
+
+## Goal
+
+`moq-studio` is run, not only compiled, on Windows, and whatever only shows
+up there is fixed: camera, display, window, and microphone sources, plus the
+window, preview, program, and publish path. Only Linux was built and run when
+the studio landed.
+
+## Plan
+
+- System audio is `Unsupported` there until
+  [Windows capture parity](https://github.com/moq-dev/moq/blob/main/quest/m2/capture-windows.md)
+  adds WASAPI loopback, so that quest runs it.
+- Build with `--features capture`, since a default build has image, color,
+  and broadcast sources only.
+
+## Related
+
+- [Hardware validation](https://github.com/moq-dev/moq/blob/main/quest/m3/video-hardware.md) - capture paths not yet run on real machines

quest/m0/packaging.md

@@ -22,7 +22,8 @@ compositor imports without a copy.
 ## Required
 
 - [Signing identities are available](/quest/m0/signing.md) - the credentials signing needs
-- [Studio on macOS and Windows](/quest/m0/app.md) - the studio running on every platform it packages
+- [Studio on macOS](/quest/m0/app-macos.md) - the studio running on macOS
+- [Studio on Windows](/quest/m0/app-windows.md) - the studio running on Windows
 
 ## Related
 

quest/m0/vcam/macos.md

@@ -9,4 +9,4 @@ update installs the new extension without a reboot.
 ## Required
 
 - [Signing identities are available](/quest/m0/signing.md) - system extensions only load when signed
-- [Studio on macOS and Windows](/quest/m0/app.md) - the studio running on macOS
+- [Studio on macOS](/quest/m0/app-macos.md) - the studio running on macOS

quest/m0/vcam/windows.md

@@ -8,4 +8,4 @@ Apps list it as a camera while the studio runs.
 
 ## Required
 
-- [Studio on macOS and Windows](/quest/m0/app.md) - the studio running on Windows
+- [Studio on Windows](/quest/m0/app-windows.md) - the studio running on Windows