Use Opus 4.6 as default tokenizer for non-Claude models #6170

Job	Run time
build-and-check	3m 2s
test-integration-packages/internal	1m 19s
test-integration-packages/billing	1m 13s
test-integration-sdk	1m 21s
test-integration-web	51s
test-integration-common	44s
test-integration-packages/agent-runtime	43s
test-integration-cli	51s
test-packages/billing	37s
test-common	51s
test-cli	49s
test-packages/internal	52s
test-packages/agent-runtime	42s
test-sdk	40s
test-web	54s
test-.agents	49s
	16m 18s

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