docs(readme): canonicalize root README to fleet skeleton #945

Job	Run time
Run CI Pipeline / 🔎 Check	30s
Run CI Pipeline / 🧪 Test Matrix (26.1.0, ubuntu-latest)	41s
Run CI Pipeline / 🧪 Test Matrix (26.1.0, windows-latest)	1m 19s
Run CI Pipeline / 🧪 Test Matrix (26.1.0, macos-latest)	51s
Run CI Pipeline / 🏷️ Type Check	-1s
Run CI Pipeline / 🧹 Lint	-1s
	3m 19s

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