Fix base2-free to allow deepseek/kimi #6488

Job	Run time
build-and-check	3m 19s
test-integration-packages/internal	1m 0s
test-integration-packages/billing	1m 9s
test-integration-web	48s
test-integration-common	50s
test-integration-cli	40s
test-.agents	39s
test-integration-packages/agent-runtime	46s
test-sdk	41s
test-integration-sdk	1m 19s
test-cli	55s
test-packages/agent-runtime	43s
test-web	1m 11s
test-common	44s
test-packages/billing	42s
test-packages/internal	46s
	16m 12s

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