[sikoGD]

Summary

• move credentials to environment variables and add a safe template
• use Twitch's TLS IRC endpoint with OAuth formatting and IRC capabilities
• replace shared state/busy waiting/substrings with a queued controller and exact chat commands
• add graceful shutdown, validation, current setup documentation, tests, and GitHub Actions CI
• ignore local emulator, ROM, save, and credential assets going forward

Verification

python -m unittest -v
python -m py_compile play.py

The legacy emulator and game assets remain untouched on master; this PR only modernizes the controller source and repository hygiene.