tri-bot Phase 2: /model, /resume, /sessions commands

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Overview

Add session management and model switching commands to tri-bot.

Commands

/model <name>

• Set Claude model for subsequent requests
• Maps to claude --model <name> flag
• Store in BotState.current_model
• Example: /model claude-sonnet-4-20250514

/resume <id>

• Resume a previous Claude session by ID
• Maps to claude --resume <id> flag
• Example: /resume abc-123

/sessions

• List recent Claude sessions
• Maps to claude sessions list --json
• Format as numbered list in Telegram

Files to modify

File	Change
MODIFY handlers.zig	Add handleModel, handleResume, handleSessions
MODIFY bot_loop.zig	Add dispatch for new commands
MODIFY telegram_api.zig	Add BotState to BotConfig or separate

Acceptance criteria

• /model opus switches model, confirms in Telegram
• /resume <id> resumes session, sends response
• /sessions lists recent sessions with IDs
• State persists across commands within same bot run

Depends on: #54