feat(agents): align ruby and kana computer-use support (#514)

* feat(agents): align ruby and kana computer-use support

Assisted-by: DeepSeek Harness (deepseek-flash)

* test(agents): keep one full-host test for ruby and kana

Both guests run the same agent configuration, so a second full-host test
does not add coverage.

Assisted-by: DeepSeek Harness (deepseek-flash)

* fix(computer-use): disable cua-driver telemetry before start

The i3 init hook did not reliably disable the default-on setting, so both
hosts could start the daemon with telemetry enabled.

Assisted-by: DeepSeek Harness (deepseek-flash)

home/hosts/linux/idols-kana.nix

@@ -7,4 +7,6 @@
   modules.desktop.computerUse.enable = true;
   # localhost-only VNC server for manual access (use an SSH tunnel).
   modules.desktop.computerUse.vnc = true;
+  # trycua/cua driver.
+  modules.desktop.computerUse.cuaDriver = true;
 }

home/hosts/linux/idols-ruby.nix

@@ -7,6 +7,6 @@
   modules.desktop.computerUse.enable = true;
   # localhost-only VNC server for manual access (use an SSH tunnel).
   modules.desktop.computerUse.vnc = true;
-  # trycua/cua driver, grey-tested on ruby only.
+  # trycua/cua driver.
   modules.desktop.computerUse.cuaDriver = true;
 }

home/linux/gui/i3/default.nix

@@ -54,11 +54,6 @@ let
       DBUS_SESSION_BUS_ADDRESS="unix:path=''${XDG_RUNTIME_DIR}/bus" \
       ${pkgs.glib.bin}/bin/gsettings set org.gnome.desktop.interface toolkit-accessibility true \
       >/dev/null 2>&1 || true
-
-    ${lib.optionalString cfg.cuaDriver ''
-      # cua-driver sends content-free telemetry by default; turn it off.
-      ${pkgs.cua-driver}/bin/cua-driver telemetry disable >/dev/null 2>&1 || true
-    ''}
   '';
 in
 {
@@ -201,6 +196,9 @@ in
           "DISPLAY=${display}"
           "XDG_SESSION_TYPE=x11"
         ];
+        # cua-driver sends content-free telemetry by default. Do this before
+        # the daemon starts so activation does not depend on the i3 session.
+        ExecStartPre = "${pkgs.cua-driver}/bin/cua-driver telemetry disable";
         ExecStart = "${pkgs.cua-driver}/bin/cua-driver serve";
         Restart = "always";
         RestartSec = 2;