Function create_conversation 

pub async fn create_conversation(
    exec_ctx: &ExecutionContext,
) -> ExecutorResult<ConversationData>

Create a new conversation and return its data.

Exposes the conversation-creation step as a standalone function so callers (e.g. agentic-server, Praxis filters, or tests) can pre-create a conversation before submitting response turns.

Errors

Returns [ExecutorError] if the conversation store is unavailable.