evalbuff: carve-based eval pipeline (delete & rebuild) #6021

Job	Run time
build-and-check	3m 17s
test-integration-packages/billing	1m 8s
test-integration-packages/internal	1m 13s
test-integration-common	44s
test-integration-web	46s
test-integration-cli	44s
test-integration-sdk	1m 27s
test-integration-packages/agent-runtime	45s
test-common	53s
test-cli	56s
test-packages/agent-runtime	50s
test-.agents	49s
test-packages/billing	45s
test-packages/internal	45s
test-web	54s
test-sdk	50s
	16m 46s

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