New wakeup flow:
1. Create private Discord channel for the agent
2. Send wakeup message with slot context + workflow reference
3. If Dirigent detected (globalThis.__dirigent), create work-type channel
4. Fallback to api.spawn if Discord not configured
New config fields: discordBotToken, discordGuildId
New file: plugin/calendar/discord-wakeup.ts
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
