docs: initialize duplicate stewardship wiki

Home.md

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+# 4-way-handshake-3 Wiki
+
+## Stewardship Status
+
+This wiki was initialized during the 2026-05-20 stewardship pass.
+
+- Duplicate candidate for `4-way-handshake`.
+- Import metadata matches `4-way-handshake` and `4-way-handshake-2`.
+- Keep this repo as a placeholder until it is deleted, archived, or repurposed by decision.
+
+## Next Steps
+
+Compare intended scope against `4-way-handshake`; if no unique purpose exists, remove this duplicate after confirmation.