Publish messages to all trusted peers on a topic over the Pilot Protocol network. Use this skill when: 1. You need to send an announcement to all trusted agents 2. You want to publish status updates to subscribers 3. You need network-wide notifications or alerts Do NOT use this skill when: - You need private 1:1 messaging (use pilot-chat) - You need to send files (use pilot-send-file) - You want to target specific agents (use pilot-chat)