ci: test OBS backups and sync Homebrew formula

[nathanialhenniges]

Summary

• Add a CI check for sanitizer secret scrubbing and deterministic scene generation.
• Add release-triggered Homebrew Den formula PRs for future OBS Setup releases.
• Include the scrubbed Mac mini snapshot from the requested backup.

Verification

• python3 -m unittest discover -s tests -v
• actionlint .github/workflows/ci.yml .github/workflows/update-homebrew.yml
• shellcheck scripts/backup.sh
• make gen with generated files unchanged

The release workflow needs the HOMEBREW_TAP_TOKEN Actions secret with write and pull-request access to homebrew-den.

Summary by CodeRabbit

• New Features
  • Added OBS profiles for Mac mini recording, vertical recording, and Twitch streaming, with video and audio settings configured for each.
  • Added an Untitled starter scene to the Mac mini scene list, including a microphone input and quick transitions.

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📥 Commits

Reviewing files that changed from the base of the PR and between 189c998 and bca9340.

📒 Files selected for processing (11)

• .github/workflows/ci.yml
• .github/workflows/update-homebrew.yml
• AGENTS.md
• devices/mac-mini/index.json
• devices/mac-mini/profiles/Recording/basic.ini
• devices/mac-mini/profiles/Recording_Vertical/basic.ini
• devices/mac-mini/profiles/Streaming/basic.ini
• devices/mac-mini/profiles/Streaming/service.json
• devices/mac-mini/scenes/Streaming.json
• devices/mac-mini/scenes/Untitled.json
• tests/test_sanitize.py

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