Add evalbuff: iterative agent improvement via docs optimization #5988

Job	Run time
build-and-check	3m 25s
test-integration-packages/internal	1m 13s
test-integration-packages/billing	1m 5s
test-integration-sdk	1m 23s
test-integration-web	50s
test-integration-common	41s
test-common	43s
test-.agents	50s
test-packages/agent-runtime	44s
test-integration-packages/agent-runtime	42s
test-packages/billing	47s
test-web	49s
test-integration-cli	42s
test-sdk	44s
test-packages/internal	1m 2s
test-cli	54s
	16m 34s

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