feat: add list command with global filters

tests/fixtures/README.md

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+# Test Fixtures
+
+This directory stores sample filesystem layouts used by CLI integration and contract
+tests. Keep fixtures small and descriptive so test output remains easy to reason
+about.
+
+## Naming Conventions
+
+- Use one subdirectory per scenario (e.g., `basic-mixed-types`, `nested-hidden-files`).
+- Include a `README.md` inside complex scenarios to explain intent when necessary.
+- Avoid binary assets larger than a few kilobytes; prefer small text placeholders.
+
+## Maintenance Tips
+
+- Regenerate fixture trees with helper scripts instead of manual editing whenever possible.
+- Document any platform-specific quirks (case sensitivity, symlinks) alongside the fixture.
+- Update this file when adding new conventions or shared assumptions.