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Decide vendored-entry liveness through one discovery verdict #1154

Job	Run time
matrix (ubuntu-latest, 2022.12.19 2026.8.0, crlf marker-excluded extras category)	4m 21s
matrix (ubuntu-latest, 2018.11.26 2020.11.15 2021.11.23 2022.12.19 2023.12.1 2024.4.1 2025.1.3 20...	7m 20s
matrix-macos	-1s
	11m 40s