Disambiguate compact Codex session ids #145

Job	Run time
build (x86_64-apple-darwin, macos-latest)	8m 50s
build-linux-host-simd	16m 1s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	5m 55s
build (aarch64-unknown-linux-gnu, ubuntu-latest)	8m 14s
build (aarch64-apple-darwin, macos-latest)	9m 3s
release	1s
	48m 4s

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