Recording and screenshots

1. Pick the computer (computer_list, or pass computer — it switches).
2. Check request_access when readiness is unknown. On a supported target, use recording_start with optional display, region, fps and durationSec (macOS auto-stop), or intervalMs (HarmonyOS snapshot cadence).
3. Do the work (or let the user do it).
4. recording_stop with the returned id → finalized file path + bytes.
5. recording_list shows everything saved; recording_status checks one.

Platform truths:

• macOS: ScreenCaptureKit inside the signed helper captures a display or region straight to .mov — no system recorder selection UI and no desktop dimming overlay. If capture is denied, Screen Recording permission is missing for whoever ran it: the Codewhale Computer Use app when request_access says via: "app", else the terminal that hosts the server — tell the user which, do not retry.
• Windows and Linux: recording is unavailable pending session-owned recorder cleanup. Use screenshots; installing ffmpeg does not enable it.
• HarmonyOS: no native CLI recorder; the backend captures snapshot_display frames at intervalMs and muxes with ffmpeg on stop. The receipt labels the mode snapshot-series — never call it real-time.

Screenshots: screenshot returns the saved path and raster geometry; zoom crops the latest raster when a target is too small to read.