docs: add duplicate stewardship readme

README.md

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+# 4-way-handshake-3
+
+Duplicate candidate for `4-way-handshake`.
+
+## Stewardship Status
+
+- Gitea repository was empty during the 2026-05-20 stewardship pass.
+- Import metadata matches `4-way-handshake` and `4-way-handshake-2`.
+- Keep this repo as a placeholder until you confirm whether it should be deleted, archived, or repurposed.
+- Do not publish private captures, credentials, keys, or third-party network data.
+
+## Next Steps
+
+Compare intended scope against `4-way-handshake`; if no unique purpose exists, remove this duplicate after confirmation.