feat: add Pengine manifest documentation

[maximedogawa]

• Introduced a new SOUL.md file outlining the purpose, architecture, and trust model of Pengine.
• Described the separation of capabilities into isolated components and the importance of user control over automation.
• Provided a clear framework for understanding trust layers and their implications for security and user choice.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f5100aab-c604-446c-9398-2b0d2531205d

📥 Commits

Reviewing files that changed from the base of the PR and between 21f0fc7 and da48b0d.

📒 Files selected for processing (1)

• SOUL.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 17-feature-formulate-manifest

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