Show the model name, and request info if possible, on error

[esnible]

A minor change to include the model name when reporting model failures.

If the failure is due to network connectivity, the output now includes that. Where before we logged

basic.pdl:4 - Error during model call: ConnectError('[Errno 61] Connection refused')

we now show

basic.pdl:4 - model 'ollama/granite-code:8b' encountered ConnectError('[Errno 61] Connection refused') trying to POST against http://localhost:11434/api/generate

[vazirim]

LGTM