Add evalbuff: iterative agent improvement via docs optimization #5994

Job	Run time
build-and-check	3m 16s
test-integration-packages/billing	1m 3s
test-integration-packages/internal	1m 8s
test-integration-cli	45s
test-integration-sdk	1m 21s
test-integration-common	48s
test-packages/agent-runtime	54s
test-common	43s
test-integration-web	42s
test-integration-packages/agent-runtime	45s
test-packages/billing	41s
test-cli	59s
test-.agents	43s
test-packages/internal	55s
test-web	51s
test-sdk	51s
	16m 25s

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