[DOC REVIEW] MILESTONES_OVERVIEW.md needs update

[github-actions]

Document Review Required

File: MILESTONES_OVERVIEW.md
Reason: Past review date by 2 days (was due February 14, 2026)
Expected cadence: monthly

Action Required

1. Review the document for accuracy
2. Update any stale content
3. Bump the Last Updated date
4. Set the next Next Review date
5. Verify no confidential content per DOCUMENT_CLASSIFICATION_POLICY.md

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