Channel Hub — framework-agnostic messaging abstraction

[jaylfc]

Implemented the Channel Hub abstraction layer:

• 6 connectors: Telegram, Discord, Slack, Email (IMAP/SMTP), Web Chat (WebSocket), Webhooks
• 17 framework adapters: SmolAgents, PocketFlow, OpenClaw, Langroid, Swarm, PicoClaw, ZeroClaw, MicroClaw, IronClaw, NullClaw, Moltis, NemoClaw, TinyAgent, Hermes, Agent Zero, nanoclaw + generic fallback
• Universal message format with structured responses (buttons, images, cards) and inline hint fallback
• Per-agent or shared bot mode
• Channel Hub routes for connect/disconnect/status
• Agent config export/import (portable JSON with channels + group memberships)

TinyAgentOS owns the messaging connections, not the agent framework. Switch frameworks without losing channels, history, or connections.

[jaylfc]

Completed. 6 connectors, 17 framework adapters, universal message format, agent export/import. All tests passing (697 total).