v0.1.0 — initial release

Telethon userbot wrapped behind a proper REST API and MCP endpoint.

Features:
- 15 REST endpoints covering messages, dialogs, files, group management
- MCP streamable HTTP at /mcp/ — all tools available to AI agents
- Bearer token auth via TELETHON_AUTH_KEY
- Interactive login helper (docker run psyb0t/telethon login)
- TELETHON_SESSION auto-written to .env via make login
- 24 integration tests against real Telegram, no mocks