v0.6.0

Features

• Virtual pet companion (#111). Tomo now has a pet that lives at ~/.tomo/data/pet.json. Five MCP tools on tomo-internal let the agent interact with it: pet_hatch, pet_status, pet_feed, pet_play, pet_sleep. Stats decay over time; affection drives evolution through six stages (egg → baby → child → teen → adult → elder). PetScheduler ticks every hour inside the process — no cron setup needed. Notifications fire on hunger/health drops and evolution events.