[codex] Fix local agent discovery imports #6752

Job	Run time
build-and-check	2m 58s
test-integration-packages/billing	1m 0s
test-integration-packages/internal	1m 3s
test-integration-common	40s
test-integration-packages/agent-runtime	40s
test-integration-sdk	1m 29s
test-integration-web	39s
test-integration-cli	47s
test-common	51s
test-packages/internal	57s
test-cli	1m 5s
test-packages/billing	42s
test-sdk	47s
test-packages/agent-runtime	43s
test-.agents	51s
test-web	54s
	16m 6s

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