[codex] Configure freebuff agents by model #6478

Job	Run time
build-and-check	3m 1s
test-integration-cli	44s
test-integration-packages/agent-runtime	43s
test-integration-web	47s
test-cli	57s
test-web	1m 8s
test-common	45s
test-packages/internal	49s
test-packages/agent-runtime	46s
test-integration-sdk	1m 26s
test-integration-packages/billing	1m 6s
test-.agents	45s
test-integration-common	48s
test-sdk	41s
test-packages/billing	50s
test-integration-packages/internal	1m 7s
	16m 23s

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