Network monitor & HTTP

Two complementary network features sit on the CDP Network domain:

• Network monitor — tab.monitor() (feature monitor) is a long-lived Stream<NetworkEvent> of completed HTTP exchanges, WebSocket frames, and EventSource messages. Passive: it observes, never modifies.
• Browser-context HTTP — tab.request() (always available) makes an HTTP request from the browser context, inheriting the page's cookies and CORS, with an opt-in privileged bypass.

For one-shot "await the next response and assert on it" use the expect surface instead; for modifying or blocking requests use Interception (the active Fetch domain). The monitor is the persistent, read-only generalization of expect_response.