Fixes and updates:
- README.md: Remove duplicate heartbeat troubleshooting section
- docs/getting-started.md: Fix Node version (18→20), commands, repo URL
- docs/commands.md: Rewrite with accurate command list (/start, /status, /heartbeat)
- docs/README.md: New multi-channel architecture diagram
- docs/whatsapp-setup.md: Add selfChatMode safety docs, media support section
- docs/slack-setup.md: Fix broken links
New documentation:
- docs/configuration.md: Complete YAML config reference
- docs/cron-setup.md: Scheduling guide (cron jobs + heartbeats)
Written by Cameron ◯ Letta Code
"Documentation is a love letter that you write to your future self." - Damian Conway
