shuttle v0.1.12

• Quieter serve log off Linux. On macOS and Windows the computer verbs no longer try the Linux MIT-SHM grabber on each call, so the serve log no longer repeats desk: MIT-SHM capture unavailable, using cua-driver for every computer call.
• Bundled: cua-driver v0.37.0-loomhand.4 (was v0.37.0-loomhand.2): on macOS the agent cursor overlay repaints only the region around its cursors instead of the whole screen each animation frame, so a background press_key, type_text or scroll takes about 0.5–0.6 s in place of 1.3–2.3 s while the cursor animates on a GPU-less VM; on Linux under xfwm4, a background type_text into a window behind another no longer leaves the front window looking inactive: the focus guard puts back the window manager's active window by moving the core focus through None and back, where it used to report not_restored after its full restore budget (about 1.1 s → 0.64 s per call on cross-app pairs).