Engines and runtime

This section is about how Sentinel actually carries a run.

That means the harness around the model, the local runtimes, the thread state, the repo state, child work, and generated media.

Start here:

• Sentinel engine
• Thread state
• Context compaction
• Codex runtime
• Claude Code
• GitHub Copilot
• Sub-agents
• Repo state and checkpoints
• Generated media

If you only need the short list of engines, providers, and integrations, the reference section is enough.

If you want the deeper mechanics, stay here.