docs: add stewardship readme

README.md

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+# 4-way-handshake
+
+Repository placeholder for authorized wireless security research notes.
+
+## Stewardship Status
+
+- Gitea repository was empty during the 2026-05-20 stewardship pass.
+- This repo should be treated as the canonical slot unless you choose another.
+- Duplicate candidates exist: `4-way-handshake-2` and `4-way-handshake-3`.
+- Do not publish private captures, credentials, keys, or third-party network data.
+
+## Next Steps
+
+Confirm whether this repo should remain canonical, then archive or delete duplicates after preserving any required history.