Add /dog command to switch Telegram chat to dog wolt

[woltspace-jerpint]

Summary

Add a /dog command to the Telegram bot that switches the active chatter to the dog wolt (Haiku). This is the inverse of /wolt <name> — instead of routing messages to a rodent session, messages go to the dog.

Current behavior

• /wolt <name> sets active_wolt in chat state → messages route to that wolt's Claude Code session
• When active_wolt is empty → messages route to _handle_dog() (bot's Haiku LLM)
• No way to switch back to dog without killing the active session

Proposed behavior

• /dog clears active_wolt and active_session from the chat state
• Subsequent messages route to _handle_dog() — the dog becomes the main chatter
• Dog ack message confirms the switch (e.g. "🐶 tail wag — I'm here!")
• Add to /help output

Implementation

• Add handle_dog command handler in container/bot/telegram_adapter.py
• Clear chat state (active_wolt, active_session) for the calling chat
• Register command alongside existing handlers (~line 1077)
• Update help text (~line 1026)

Files

• container/bot/telegram_adapter.py — command handler + help text