[codex] Tolerate absolute file tool paths #595

Job	Run time
build-freebuff	1m 23s
build-and-smoke-freebuff-windows	2m 24s
e2e-agent-startup	2m 26s
e2e-ads-behavior	1m 8s
e2e-help-command	1m 5s
e2e-terminal-command	1m 8s
e2e-version	1m 4s
e2e-slash-commands	52s
e2e-code-edit	56s
e2e-startup	1m 12s
	13m 38s

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