[codex] Raise MiniMax instant admit threshold #6243

Job	Run time
build-and-check	3m 4s
test-integration-packages/internal	1m 7s
test-integration-packages/billing	1m 1s
test-integration-web	50s
test-integration-packages/agent-runtime	42s
test-integration-sdk	1m 24s
test-integration-common	50s
test-cli	1m 5s
test-integration-cli	46s
test-web	55s
test-packages/billing	39s
test-common	46s
test-.agents	46s
test-packages/agent-runtime	47s
test-packages/internal	50s
test-sdk	46s
	16m 18s

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