docs: initialize stewardship wiki

Home.md

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+# car-fob-killer Wiki
+
+## Stewardship Status
+
+This wiki was initialized during the 2026-05-20 stewardship pass.
+
+- Repo was empty before README initialization.
+- Keep experiments limited to devices you own or are explicitly authorized to test.
+- Do not publish private captures, keys, firmware dumps, or target-specific data unless lawful and intentional.
+
+## Next Steps
+
+Document scope, hardware inventory, build process, test environment, license, and release policy before uploading code or binaries.