Adds a `timer` command that immediately confirms the timer and posts a
notification back to Campfire when it fires, using CAMPFIRE_URL and
CAMPFIRE_TOKEN. Adds godotenv so the bot loads a .env file automatically
on startup. Includes a .env.example documenting all env vars.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Use unique user in unknown command test to avoid last-command fallback
interference. Add plugin architecture with registered commands.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
