docs: initialize stewardship wiki

Home.md

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+# 4-way-handshake Wiki
+
+## Stewardship Status
+
+This wiki was initialized during the 2026-05-20 stewardship pass.
+
+- Canonical candidate for the `4-way-handshake` duplicate group.
+- Duplicate candidates: `4-way-handshake-2`, `4-way-handshake-3`.
+- Keep private captures, credentials, keys, and third-party network data out of the wiki.
+
+## Next Steps
+
+Confirm the canonical repo, then remove or archive duplicates after preserving anything needed.