feat(chatgpt): add explicit windows-cdp desktop surface

[KasumiChen]

Summary

• add explicit ChatGPT desktop surface selection for CDP-backed flows
• keep existing macOS native behavior as the default surface
• add opt-in windows-cdp / macos-cdp handling for status, read, and send
• improve ChatGPT CDP target scoring and busy-state readback cleanup

Compatibility

• default opencli chatgpt ... behavior remains macos-native
• new and ask remain macOS-native only
• no implicit switch just because OPENCLI_CDP_ENDPOINT is set
• default output surface remains narrow/compatible (Status, Role/Text)
• Windows support is explicit opt-in via --surface windows-cdp

Example

export OPENCLI_CDP_ENDPOINT=http://127.0.0.1:9224
export OPENCLI_CDP_TARGET=chatgpt
opencli chatgpt status --surface windows-cdp
opencli chatgpt send --surface windows-cdp "Reply with exactly OK and nothing else."
opencli chatgpt read --surface windows-cdp

Validation

• npm run typecheck
• npm test
• npm run build
• live smoke on a real Windows ChatGPT desktop CDP endpoint for status/read/send --surface windows-cdp