[codex] Use baseline Bun target for Windows builds #6643

Job	Run time
build-and-check	3m 1s
test-integration-packages/billing	1m 7s
test-integration-packages/internal	1m 5s
test-integration-packages/agent-runtime	39s
test-integration-web	41s
test-integration-cli	40s
test-integration-sdk	1m 20s
test-integration-common	43s
test-.agents	42s
test-packages/internal	47s
test-sdk	42s
test-packages/agent-runtime	41s
test-common	39s
test-cli	1m 4s
test-packages/billing	50s
test-web	1m 0s
	15m 41s

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