quest: plan the follow-ups of #73 and #74

quest/m0/README.md

@@ -101,6 +101,9 @@ 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 on the GPU under X11 on NVIDIA](/quest/m0/cef-x11-nvidia.md) - the X11 GPU path paints on NVIDIA, or falls back to the CPU path loudly
+- [A browser helper exits with the studio](/quest/m0/browser-helper-exit.md) - no orphaned CEF helper after a crash, kill, or timed-out test
+- [Nightly and the browser suite pass](/quest/m0/nightly-green.md) - render-sw, cookies, and the X11 clipboard test fixed at their causes
+- [GPU tests exit cleanly on NVIDIA](/quest/m0/gpu-tests-exit.md) - compositor tests no longer crash on exit on NVIDIA
 - [The Apple signing identity is available](/quest/m0/signing.md) - the Apple credentials packaging and the macOS camera need; Windows ships unsigned
 - [Packaging](/quest/m0/packaging.md) - a signed macOS app, a Windows installer, and a Flatpak for Linux
 - [The persistable portal restore token is pinned](/quest/m0/pin-portal-token.md) - moq-video's restore token, for Wayland sources

quest/m0/browser-helper-exit.md

@@ -0,0 +1,24 @@
+# [S] A browser helper exits with the studio
+
+## Goal
+
+When the studio process dies for any reason (a crash, a kill, or a test that
+times out), its CEF browser helper and the helper's children exit too, on
+Linux, macOS, and Windows. No orphaned helper keeps running against the
+desktop.
+
+## Plan
+
+From [moq-dev/studio#73](https://github.com/moq-dev/studio/pull/73), picked
+2026-11-07 (maintainer, /quest-complete), m0 by the rule that fixes join m0.
+
+- The helper runs in its own process group
+  (`rs/moq-scene/src/browser/run.rs`), which is killed only when the studio
+  drops it in an orderly way. On nixos2, three test runs that timed out left
+  helpers spinning against GNOME until they were killed by hand.
+- Reproduce first: kill the studio while a page is open and see what the
+  helper does. Its channel to the studio closes then; find why that does not
+  end it.
+- Fix the cause in a way that holds on every desktop, such as the helper
+  exiting when that channel closes. Linux's `PR_SET_PDEATHSIG` alone would
+  leave macOS and Windows uncovered.

quest/m0/gpu-tests-exit.md

@@ -0,0 +1,17 @@
+# [S] GPU tests exit cleanly on NVIDIA
+
+## Goal
+
+The compositor's GPU tests pass and exit cleanly on NVIDIA under Linux, as
+they do on the software driver and on Metal.
+
+## Plan
+
+From [moq-dev/studio#74](https://github.com/moq-dev/studio/pull/74), picked
+2026-11-07 (maintainer, /quest-complete), m0 by the rule that fixes join m0.
+
+On nixos (RTX 3070 Ti, NVIDIA 580), 7 compositor GPU tests, mostly the
+overlay ones, pass and then crash when the process exits. The same happens
+with `main`'s Vulkan setup and without CEF, and not on Mesa's software
+driver. Reproduce, find the cause (teardown order of the wgpu device and what
+holds it is a first suspect), and fix it rather than skipping the tests.

quest/m0/nightly-green.md

@@ -0,0 +1,26 @@
+# [M] Nightly and the browser suite pass
+
+## Goal
+
+The nightly workflow passes again, and the browser suite
+(`rs/moq-studio/tests/browser.rs`) passes on every path it runs: GPU under
+Wayland and X11, and the CPU path with no display.
+
+## Plan
+
+From [moq-dev/studio#73](https://github.com/moq-dev/studio/pull/73), picked
+2026-11-07 (maintainer, /quest-complete), m0 by the rule that fixes join m0.
+
+Nightly has failed every night since 2026-11-04; it last passed on
+2026-11-03. Known failures, each fixed at its cause:
+
+- `render-sw`: browser helpers exit on SIGTRAP
+  ([run 42235026329](https://github.com/moq-dev/studio/actions/runs/42235026329)).
+- `cookies_survive_a_restart` fails on every path, including the CPU path on
+  `main`.
+- `copy_and_cut_reach_the_clipboard` fails on X11: on that path a copy goes
+  to the X clipboard, but the test reads only the studio's own copy relay. It
+  first ran that far once #73 made X11 paint.
+
+Check the latest nightly run first, since other failures may have joined
+these.