v0.3.23

Fixes:
- Discord/Telegram/Slack channel test now sends real test messages when channel_id/chat_id is provided (#291)
- Channel hot-reload now re-reads secrets.env so API tokens persist across daemon restarts (#333)
- Tool call recovery supports 3 new patterns: <tool> tags, markdown code blocks, and backtick-wrapped calls (#332)

Features:
- Fallback model chain per agent — configure via PATCH /api/agents/{id}/config or dashboard UI (#229)
- Dashboard shows fallback chain on agent detail with add/remove controls