Add evalbuff: iterative agent improvement via docs optimization (#479) #5995

Job	Run time
build-and-check	3m 43s
test-integration-packages/billing	1m 24s
test-integration-packages/internal	1m 16s
test-integration-cli	1m 3s
test-integration-common	53s
test-integration-web	1m 1s
test-integration-sdk	1m 26s
test-integration-packages/agent-runtime	1m 10s
test-common	54s
test-web	1m 0s
test-packages/agent-runtime	1m 3s
test-sdk	1m 2s
test-packages/billing	53s
test-.agents	1m 2s
test-cli	1m 11s
test-packages/internal	1m 4s
	20m 5s

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