Summary

• Fix explicit computer_use capture(app=...) targeting for macOS apps whose usable AX window is not returned by list_windows(on_screen_only=True)
• Add normalized window selection and fallback to all windows for explicit app filters
• Add a regression test covering the DaVinci Resolve-style off-screen main window case

Test Plan

• scripts/run_tests.sh tests/tools/test_computer_use.py

Real behavior proof

• Behavior or issue addressed: computer_use capture(app="DaVinci Resolve") could fall back to iTerm2 because DaVinci Resolve's main AX window appeared only when listing all windows, not on-screen-only windows.
• Real environment tested: macOS M5 Max, DaVinci Resolve running locally, cua-driver 0.1.9, Accessibility and Screen Recording granted.
• Exact steps or command run after this patch: CUA_DRIVER_MCP_NO_RELAUNCH=1 hermes chat -q 'Käytä vain computer_use-työkalua. Tee capture mode=ax app="DaVinci Resolve"...' --toolsets computer_use -Q
• Evidence after fix: Tool result reported App/window: DaVinci Resolve, “Untitled Project” and Elementtimäärä: 104.
• Observed result after fix: Explicit app targeting selected DaVinci Resolve instead of iTerm2. A mode=som read-only capture also selected DaVinci Resolve and returned 104 interactable elements, but no screenshot dimensions.
• What was not tested: No clicks, typing, focus changes, or Resolve UI mutations were performed.