Rework evalbuff: commit learning, parallel agents, trace compression #5998

Job	Run time
build-and-check	3m 12s
test-integration-packages/billing	1m 4s
test-integration-packages/internal	1m 13s
test-integration-common	48s
test-integration-web	43s
test-integration-cli	43s
test-integration-sdk	1m 20s
test-integration-packages/agent-runtime	43s
test-sdk	46s
test-cli	57s
test-web	52s
test-packages/internal	48s
test-packages/agent-runtime	52s
test-packages/billing	39s
test-.agents	46s
test-common	42s
	16m 8s

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