Add evalbuff: iterative agent improvement via docs optimization #5985

Job	Run time
build-and-check	3m 0s
test-integration-packages/internal	1m 5s
test-integration-packages/billing	1m 10s
test-integration-web	41s
test-integration-common	46s
test-integration-sdk	1m 40s
test-integration-cli	44s
test-common	49s
test-packages/internal	54s
test-integration-packages/agent-runtime	44s
test-sdk	44s
test-cli	53s
test-web	48s
test-packages/billing	44s
test-packages/agent-runtime	47s
test-.agents	41s
	16m 10s

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