`func durable` or `func durable help` shows `Could not find local host metadata file 'host.json'`

The help output for `func durable` commands should ideally not complain with `Could not find local host metadata file 'host.json'`.

Start by running `func durable` and `func durable help` in the Azure Functions Core Tools repository to reproduce the message. Trace the CLI help entry point and its handling of host metadata, then verify that both commands display help without complaining about a missing `host.json` file.

Written by the indexing model from the issue text.