feat: screen intelligence pipeline + CLI + keep_screenshots config (#339)

* feat: add keep_screenshots functionality to Screen Intelligence settings

- Introduced a new `keep_screenshots` option in the Screen Intelligence settings, allowing users to save captured screenshots to the workspace instead of deleting them after processing.
- Updated relevant components and tests to reflect this new feature, ensuring consistent behavior across the application.
- Enhanced the user interface to include a checkbox for the `keep_screenshots` setting, improving user experience and configurability.

* feat: add `openhuman screen-intelligence` CLI for standalone testing

Adds a dedicated CLI (mirroring `openhuman skills`) to run the screen
intelligence capture + vision pipeline without the full desktop app.

Subcommands: run, status, capture, start, stop.
Makes save_screenshot_to_disk public so the CLI capture --keep flag works.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: add keep_screenshots to ScreenIntelligencePanel test assertion

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/components/intelligence/__tests__/ScreenIntelligenceDebugPanel.test.tsx

@@ -74,6 +74,7 @@ const sampleStatus: AccessibilityStatus = {
     session_ttl_secs: 300,
     panic_stop_hotkey: 'Cmd+Shift+.',
     autocomplete_enabled: true,
+    keep_screenshots: false,
     allowlist: [],
     denylist: [],
   },