docs: initialize stewardship wiki

Home.md

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+# wifi--killer Wiki
+
+## Stewardship Status
+
+This wiki was initialized during the 2026-05-20 stewardship pass.
+
+- Repo was empty before README initialization.
+- Keep work limited to authorized lab hardware and networks.
+- Do not publish credentials, private captures, keys, or live target data.
+
+## Next Steps
+
+Document hardware, build requirements, safety boundaries, license, and release policy before uploading firmware or tooling.