[codex] Use baseline Bun target for Windows builds (#688) #6644

Job	Run time
build-and-check	2m 56s
test-integration-packages/internal	1m 5s
test-integration-cli	41s
test-integration-packages/billing	1m 12s
test-integration-common	43s
test-integration-packages/agent-runtime	42s
test-packages/internal	50s
test-cli	55s
test-common	45s
test-integration-sdk	1m 23s
test-.agents	40s
test-packages/agent-runtime	45s
test-integration-web	48s
test-packages/billing	39s
test-web	55s
test-sdk	51s
	15m 50s

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