[codex] Use baseline Bun target for Windows builds #6642

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 17s
test-integration-packages/billing	1m 23s
test-integration-cli	49s
test-integration-common	50s
test-integration-web	42s
test-integration-packages/agent-runtime	37s
test-integration-sdk	1m 13s
test-cli	56s
test-packages/agent-runtime	58s
test-common	43s
test-.agents	47s
test-sdk	46s
test-web	52s
test-packages/billing	50s
test-packages/internal	46s
	16m 36s

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