fix: share reliable virtual key delivery across Linux rigs

docs/validation.md

@@ -466,3 +466,34 @@ The headless e2e restores keyboard focus after virtual-pointer commands and
 holds virtual keys briefly: instantaneous virtual input can disappear before
 GPUI/Wayland dispatch. Keyboard actions update the editor entity directly,
 avoiding a nested window borrow during event dispatch.
+
+After merging clips and playback at `dd016f7`, the clips rig intermittently
+reported “desktop did not honour Quit”. A fresh-window probe on 2026-10-08
+missed 3 of 8 instantaneous `wtype` Ctrl+Q presses; two missed presses occurred
+while Clipbin was focused. Temporary action/GUI-exit/worker-join markers showed
+that the missed presses never reached the Quit handler. All 8 held-key attempts
+reached the handler and completed shutdown. The temporary markers were removed;
+no application shutdown change was needed.
+
+Both scripts now source `scripts/rig/keys.sh`: it restores keyboard focus after
+virtual-pointer input, gives the virtual keymap 200 ms to settle, and holds each
+key for 100 ms. Modified keys also give the modifier 100 ms to settle. Delivery
+has a 10-second timeout; each script still requires the actual desktop process
+to exit successfully. Serial reruns passed with
+`env PATH=/usr/bin:/bin:$HOME/.cargo/bin`:
+
+- `scripts/validate/linux-clips.sh /tmp/clipbin-clips-quit-fixed`: H.264 retained,
+  360 CFR frames over a six-second aligned clip, continuous audio, zero decode
+  errors, original press range, bookmark protection, tiny-budget cleanup,
+  bookmark re-export after adjacent removal, and both Quit exits.
+- `scripts/validate/linux-playback.sh /tmp/clipbin-playback-quit-fixed`: moving
+  preview (4.1% changed pixels), device audio RMS 0.08045, thumbnails, active
+  capture, seek/gap/boundary behaviour, volume/mute, frame stepping and both Quit
+  exits. Decode median/p95 were 2.578/4.073 ms; GPUI upload median/p95 were
+  0.241/0.408 ms.
+
+Logs are `/tmp/clipbin-clips-quit-fixed.log` and
+`/tmp/clipbin-playback-quit-fixed.log`; screenshots are in their corresponding
+output directories. `bash -n`, `git diff --check` and `cargo fmt --check` also
+passed. This follow-up changes only the Linux rig scripts and documentation;
+Windows runtime and real Hyprland validation limits above remain unchanged.