Support analytics configuration

**Problem**
When working with config, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

Start by locating the configuration handling and the existing error paths in the terminal agent. Review how analytics configuration is expected to work, then verify that configuration failures produce detailed, useful messages and that the supported analytics setting is handled consistently.

Written by the indexing model from the issue text.