Enable the interaction data attachment in main.gd game loop. When E is pressed and the prompt is active, target_entity_id and verb are attached to the Interact action before sending to the server. Without a target, bare Interact is still sent as safe fallback. Completes the v0.1 interaction prompt data flow: server sends nearby_interactions → client shows prompt → E press attaches target+verb → SimBridge encodes and sends to server. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>