docs: document self-improving automation loops

[ScriptedAlchemy]

This PR stacks on #130. Review commit/diff against split/self-improving-04-dashboard-ui.

Summary

• Document self-improving loop contracts and dashboard integration notes.
• Update dashboard and dashboard-port handoff docs.
• Refresh README, CONTRIBUTING, Cursor plugin, Kiro integration, and dashboard API audit notes.

Verification

• documentation-only review

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Latest commit: 43fe723

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[chatgpt-codex-connector]

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