docs: add stewardship readme

README.md

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+# wifi--killer
+
+Repository placeholder for wireless research materials.
+
+## Stewardship Status
+
+- Gitea repository was empty during the 2026-05-20 stewardship pass.
+- README initialized so the repo has a clear landing page.
+- Keep all work limited to authorized lab hardware and networks.
+- Do not publish credentials, private captures, keys, or live target data.
+
+## Next Steps
+
+Add project scope, hardware list, build requirements, safety boundaries, license, and release notes before uploading firmware or tooling.