Jeremy Rose c2d008aca5 Collapse parsed command summaries when any stage is unknown (#13043) ...

## Summary
- collapse parsed command output to a single `Unknown` whenever the
normal parse includes any unknown entry
- preserve the existing parsing flow and existing `cd` handling,
including the current `cd && ...` collapse behavior
- trim redundant tests and add focused coverage for collapse-on-unknown
cases

## Testing
- `cargo test -p codex-shell-command`

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..

src

Collapse parsed command summaries when any stage is unknown (#13043)

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BUILD.bazel

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Cargo.toml

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