cli: dir subcommand "list" alias missing — exits 1 instead of suggesting "ls"

[namastex888]

Summary

genie dir list exits with status 1, while genie dir ls works.

Repro

1. Run genie dir list.
2. Observe exit code 1.
3. Run genie dir ls.
4. Observe the directory list succeeds.

Expected

genie dir list should either alias to genie dir ls or fail with a helpful suggestion.

Impact

The default dogfood install sanity smoke uses genie dir list, so this blocks a clean release validation path.

[namastex888]

Closed by #1482 — genie dir list alias added. Both dir ls and dir list now work. Verified empirically.