fix: add logging for start_session details

[psschwei]

Fixes #39

Adds an info-level log message when start_session() is called, displaying the backend name, model ID (resolved for the specific backend), context type, and model options (if provided).

[mergify]

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[nrfulton]

Looks good, except for the failing ruff prec-commit hook.

Please run the pre-commit hooks and push ruff's changes. I'll then approve and merge.

Thanks for the contribution!

[psschwei]

Please run the pre-commit hooks and push ruff's changes

done!

[nrfulton]

Thanks, looks good. We're in code freeze until #310 is merged. That should resolve automatically for this PR. I will merge this some time tomorrow, or ping you if there are unanticipated merge issues.

[nrfulton]

#310 is now merged. Updated this branch and re-ran workflows. Will merge on success. Thanks for the patience.