fix(studio): build moq-studio on its own

justfile

@@ -24,6 +24,9 @@ check:
     cargo fmt --all --check
     cargo clippy --locked --workspace --all-targets -- -D warnings
     cargo clippy --locked --workspace --all-targets --features {{ features }} -- -D warnings
+    # The studio as `cargo run -p moq-studio` builds it: alone, so the features
+    # only its tests' dependencies turn on cannot hide one it needs.
+    cargo check --locked -p moq-studio --features {{ features }}
 
 # Run the tests.
 [positional-arguments]

quest/m0/README.md

@@ -101,7 +101,6 @@ repository.
 - [Virtual camera](/quest/m0/vcam/README.md) - the program or a published scene exposed as a system camera on Linux, Windows, and macOS
 - [Browser sources on the GPU under Mesa](/quest/m0/cef-headless.md) - shared-texture pages paint on Intel and AMD under Wayland, and a page that cannot paint fails loudly
 - [Browser sources make no outside requests](/quest/m0/browser-offline.md) - no component updates, spellcheck downloads, or network time from the helper
-- [moq-studio builds on its own](/quest/m0/studio-builds-alone.md) - `cargo build -p moq-studio` no longer leans on a test dependency's features
 - [Unpublishing a scene ends its broadcast cleanly](/quest/m0/unpublish-clean.md) - viewers get a clean finish, not `Unroutable`, when a scene stops publishing
 - [A media file's sound plays with its pictures](/quest/m0/media-av-sync.md) - media sources write a bus latency ahead, as broadcast sources do
 - [The Apple signing identity is available](/quest/m0/signing.md) - the Apple credentials packaging and the macOS camera need; Windows ships unsigned