evalbuff: Codebuff SDK integration, direct LLM API, and quality improvements #6015

Job	Run time
build-and-check	2m 57s
test-integration-packages/billing	1m 7s
test-integration-packages/agent-runtime	51s
test-integration-web	43s
test-integration-packages/internal	1m 7s
test-.agents	44s
test-web	52s
test-packages/agent-runtime	51s
test-packages/billing	48s
test-common	42s
test-cli	59s
test-packages/internal	47s
test-integration-common	50s
test-integration-cli	39s
test-sdk	41s
test-integration-sdk	1m 32s
	16m 10s

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