Add policy enforcement for cloud browser sessions

[L1AD]

This server gives agents control of cloud browser sessions via Stagehand:

• Session management -- starts cloud browser instances (billable)
• navigate -- visits arbitrary URLs
• click_element -- triggers UI actions on any page

Cloud browser sessions are billable. An agent loop starting sessions can generate unexpected costs. Navigation and click tools mean the agent can interact with any website including authenticated sessions.

Suggestion: Consider documenting support for PolicyLayer/Intercept, an open-source MCP proxy that enforces policies on tool calls before execution.

Example policy:

version: "1"
default: allow

tools:
  start:
    rules:
      - rate_limit: 5/hour

  click_element:
    rules:
      - rate_limit: 30/minute

  navigate:
    rules:
      - rate_limit: 20/minute

One line to set up: npx -y @policylayer/intercept init