Add evalbuff: iterative agent improvement via docs optimization #5990

Job	Run time
build-and-check	3m 0s
test-integration-packages/internal	1m 19s
test-.agents	49s
test-integration-sdk	1m 28s
test-packages/billing	50s
test-integration-packages/agent-runtime	49s
test-sdk	41s
test-integration-web	44s
test-common	50s
test-packages/agent-runtime	50s
test-cli	59s
test-packages/internal	54s
test-web	55s
test-integration-common	45s
test-integration-cli	42s
test-integration-packages/billing	1m 6s
	16m 41s

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