Add channel-create, channel-edit, channel-delete, channel-move, category-create, category-edit, and category-delete actions to the unified message tool. These actions were already implemented in the Discord-specific handler but weren't accessible via the pi_message tool. Changes: - Add 7 new channel/category management actions to MessageActionSchema - Add parameters: name, type, parentId, topic, position, nsfw, rateLimitPerUser, categoryId - Gate actions behind discord.actions.channels (disabled by default) - Add execute handlers routing to existing Discord action handlers - Update Discord skill SKILL.md with documentation Channel types: 0=text, 2=voice, 4=category
- Add example for sendMessage with media attachment (file:// and https://) - Clarify that sendMessage uses 'to: channel:<id>' not 'channelId' - Document replyTo parameter for replying to specific messages - Add mediaUrl to inputs section
