Document self-healing data collection system

[giaphutran12]

Summary

• add a documented Mermaid system map for the self-healing data collection stack
• include a raw .mmd source file so the diagram can be pasted into Mermaid Live and exported
• document what works now, what is still future work, and the intended end state

Evidence

• git diff --cached --check
• public-hygiene grep for secrets/transcripts/private meeting artifacts

Notes

• No code changes.
• No auto-merge.
• This is intentionally public-safe repo documentation, not meeting notes or transcript material.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/self-healing-team-brief-doc

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[giaphutran12]

Closing stale draft cleanup PR; superseded by later BigSet work.