[codex] Use underscored direct subagent tool names (#565) #6304

Job	Run time
build-and-check	2m 52s
test-integration-cli	47s
test-integration-packages/billing	1m 11s
test-integration-common	46s
test-cli	54s
test-integration-packages/internal	1m 2s
test-packages/internal	50s
test-integration-sdk	1m 19s
test-integration-web	44s
test-packages/billing	52s
test-integration-packages/agent-runtime	50s
test-packages/agent-runtime	48s
test-common	48s
test-sdk	46s
test-.agents	1m 0s
test-web	1m 12s
	16m 41s

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