feat: add Codex CLI support, dual Discord bots, and Discord typing fix

- Add Codex as alternative agent type (agentType: 'codex' per group)
- Codex container runner with session resume and 100-turn limit
- Dual Discord bot support (DISCORD_BOT_TOKEN + DISCORD_CODEX_BOT_TOKEN)
- Each bot handles only its agentType's registered groups
- Discord typing indicator refreshes every 8s (was single-shot, expired after ~10s)
- Agent runner 100-turn limit to prevent infinite bot-to-bot loops
- Apple Container runtime support (convert-to-apple-container skill)
- Session commands (/compact) support
- DB migration for agent_type column

.env.example

@@ -1 +1,8 @@
 
+
+# Added by skill
+DISCORD_BOT_TOKEN=
+
+# Codex support (optional — only needed for Codex agent type)
+OPENAI_API_KEY=
+# CODEX_OPENAI_API_KEY=  # Use this to override OPENAI_API_KEY for Codex only