Route local-provider agents over a dedicated docker network

[Saaketh0]

Before, the GC was running directly on the machine, and communicated with the LC containers through a roundabout way of going outside the host gateway and back into the port, but now that GC is itself running inside a container, that won't work.

This fix creates a docker internal network that allows all containers to communicate with each other.

Claude Explanation Below:

Agents used to be reached at host.docker.internal:<host_port>, which only works when whatever is doing the reaching shares the host's network namespace. They now join a ventis-local docker network and are addressed by container name at the fixed container port, so routing no longer depends on the caller's vantage point.

• Local/_runtime.py: --network ventis-local instead of --add-host, VENTIS_AGENT_PORT is the container port, VENTIS_AGENT_HOST is the container name, routing_endpoint_for returns <runtime_id>:50051.
• global_controller.py: creates the network alongside the local Redis container, and derives status/metrics Redis keys from instance_manager._routing_endpoint_for instead of the host string.

Conflict resolution notes:

• Kept this branch's MAX_PORT_ATTEMPTS retry loop and env_file support around the docker run, applying the new network/env flags inside it.
• Kept _is_local_host in Local/_runtime.py; a0efb5a dropped it, but env_file_args (added later on the CLI line) still needs it.
• The controller::agent_id key written after launch, which postdates a0efb5a, now uses the container-name endpoint so it matches the keys global_controller reads back.

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