fix(native): select off-screen windows so the UI lane can complete (#8654)

* fix(native): stop calling an off-screen window absent

The native UI helper looked up its selected window with
`.optionIncludingWindow`, which returned nothing while that window was off
screen. An existing window owned by the selected process was reported as
`window-mismatch`, before any permission check, so the verifier could not reach
its permission boundary. Select from all windows instead; absent and foreign
windows still fail.

The verifier's changed-bytes check also read `error.message`, but since
cc90771af a selection failure carries its helper code in `error.issues`, so the
check could not pass. Read the issue. Together these let the permissions lane
complete on main.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* test(native): own UI test processes from the moment they launch

The off-screen test registered cleanup only after parsing the ready record, so a
startup failure left `/usr/bin/open` and its app running. The lane test killed
only the verifier on a timeout, leaving its launcher and detached fixture alive
until they expired.

Register the off-screen owner immediately after the launch; the app inherits the
run token, so the sweep needs no ready record. In the lane test, every stand-in
records itself and leaves on one release the test's cleanup awaits.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -807,6 +807,8 @@ jobs:
           tests/boundary/mcp/nativeDemangleMcp.test.ts
           tests/boundary/mcp/nativeMachoSummaryMcp.test.ts
           tests/boundary/providers/native/nativeSignatureTargetBinding.test.ts
+          tests/boundary/providers/native/nativeUiOffscreenWindow.test.ts
+          tests/boundary/process/nativeUiVerifierLane.test.ts
           tests/boundary/cli/nativeSignatureCli.test.ts
           tests/boundary/cli/nativeMachoArm64_32Cli.test.ts
           tests/boundary/cli/nativeMachoEncryptionCli.test.ts