telegram-bot: rewrite to use Pi CLI with streaming JSON output

- Replaced direct Anthropic API with Pi CLI (uses platform auth, no API key needed)
- Model: claude-sonnet-4-6
- Streaming JSON mode with live progress updates in Telegram
- Per-user session files via Pi's --session/--continue
- Auto-recovery from corrupted sessions
- 5 min timeout, not-lazy system prompt

.gitignore

@@ -9,6 +9,10 @@ __pycache__/
 .env
 
 .pi/agent-sessions/
+telegram-bot/sessions/
+telegram-bot/bot.log
+telegram-bot/bot.err
+telegram-bot/conversations.json
 
 
 .playwright-cli/