feat(flow): harden codex workflow routing and review ops #135

Job	Run time
build (aarch64-unknown-linux-gnu, ubuntu-latest)	1m 4s
build-linux-host-simd	2m 41s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	49s
build (x86_64-apple-darwin, macos-latest)	1m 5s
build (aarch64-apple-darwin, macos-latest)	1m 6s
release	0s
	6m 45s

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