- Created RF_TEST_DATABASES.md with 6 primary databases (30,000+ files)
- Added RTL433_TESTING_GUIDE.md explaining 0% decode rate
- Created download_rf_test_datasets.sh to fetch all test data
- Documented web search results from Google dorking
- Listed repositories: rtl_433_tests, FlipperZero-Subghz-DB, UberGuidoZ, etc
- Included testing strategy and expected success rates
