Add evalbuff: iterative agent improvement via docs optimization #5989

Job	Run time
build-and-check	3m 3s
test-integration-packages/internal	59s
test-integration-cli	45s
test-integration-sdk	1m 34s
test-integration-packages/agent-runtime	44s
test-integration-common	43s
test-common	44s
test-integration-packages/billing	1m 6s
test-integration-web	45s
test-packages/internal	50s
test-sdk	49s
test-.agents	49s
test-packages/billing	51s
test-web	48s
test-packages/agent-runtime	41s
test-cli	57s
	16m 8s

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