[codex] Tolerate absolute file tool paths (#632) #598

Job	Run time
build-freebuff	1m 22s
build-and-smoke-freebuff-windows	2m 27s
e2e-agent-startup	2m 20s
e2e-slash-commands	56s
e2e-ads-behavior	1m 20s
e2e-startup	1m 19s
e2e-version	59s
e2e-help-command	1m 17s
e2e-terminal-command	57s
e2e-code-edit	1m 0s
	13m 57s

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