Return the full state machine transition table for referrer requests. Each entry shows source state, target state, allowed actor, triggering event, and a human-readable label.

Use when: Call to understand all valid transitions before firing SendStateChangeEvent on a referrer request. No input parameters required.

Behavior: read_only

workspace_id / user_id are injected from request headers.

Returns transitions[] with fields: source_state target_state event action allowed_actor event_label

IMPORTANT: If the response contains more than one record, always present the options to the user and ask them to choose before taking any follow-up action. Do not act on all results automatically.