William Valentin
aa95f2132c
feat: add channel adapter abstraction with Telegram and WebChat adapters
Implement Phase 3 channel adapters that decouple message sources from
the agent via a uniform ChannelAdapter interface and ChannelRegistry.
- Add ChannelAdapter/InboundMessage/OutboundMessage types
- Add ChannelRegistry for adapter lifecycle and message routing
- Add TelegramAdapter (grammy bot, auth middleware, confirmations, chunking)
- Add WebChatAdapter (thin shim over GatewayServer)
- Refactor daemon to use ChannelRegistry with per-channel-per-user agents
- Add config.get/config.patch gateway handlers (Phase 2 loose end)
- Add system.restart gateway handler (Phase 2 loose end)
- Add implementation plans and design docs
Tests: 225 passing (33 new channel adapter + gateway handler tests)