fix: clear command should not clear corpus_client_state.json

Prevent Clear Command from Removing Login State File

Description

Currently, executing the clear command removes the login state file (corpus_client_state.json). This behavior forces users to log in again unnecessarily, even when they only intend to clear other application data.

This results in a poor user experience by introducing redundant authentication steps and interrupting workflow continuity.

Proposed Enhancement

• Modify the clear command to exclude the login state file (corpus_client_state.json) from deletion.
• Ensure that only non-authentication-related data is cleared.

Benefits

• Eliminates unnecessary re-authentication for users.
• Improves user experience and workflow efficiency.
• Provides clearer separation between clearing application data and authentication state.

Acceptance Criteria

• Executing the clear command does not delete corpus_client_state.json.
• Users remain logged in after running the clear command.
• Documentation is updated to reflect the revised behavior of the clear command.