[codex] Tolerate absolute file tool paths #6525

Job	Run time
build-and-check	3m 0s
test-integration-packages/billing	1m 3s
test-integration-packages/internal	1m 8s
test-integration-cli	42s
test-integration-common	45s
test-integration-packages/agent-runtime	45s
test-integration-web	38s
test-common	48s
test-cli	48s
test-.agents	50s
test-packages/internal	55s
test-web	1m 22s
test-sdk	45s
test-packages/agent-runtime	53s
test-packages/billing	37s
test-integration-sdk	1m 22s
	16m 21s

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