docs(bridge): correct python_bridge docstring — no HTTP transport ships

[bbopen]

Summary

• Correct the Python bridge docstring: only the stdin/stdout subprocess loop
  ships; HttpBridge connects to an operator-provided server.
• Reinforce the same server-author security contract in the policy, environment
  reference, and HTTP runtime guide.

Closes #263

Deferred

The optional allowlist/auth parameter on core dispatch is intentionally deferred;
this documentation-only change adds no dispatch code.

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