feat(codex): improve session search and workspace tooling #140

Job	Run time
build (x86_64-unknown-linux-gnu, ubuntu-latest)	6m 13s
build-linux-host-simd	14m 40s
build (x86_64-apple-darwin, macos-latest)	9m 10s
build (aarch64-apple-darwin, macos-latest)	7m 39s
build (aarch64-unknown-linux-gnu, ubuntu-latest)	7m 57s
release	8s
	45m 47s

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