Add **-aware logic to _should_exclude and create unit tests for include/exclude glob edge-cases

[filipchristiansen]

Background

PR #279 solved Issue #275 by updating _should_include so recursive (**) patterns finally work.

During review two follow-ups were identified:

1. Exclude logic gap – _should_exclude still has a TODO about handling **. Understand if this is needed.
2. Missing test coverage – There are no unit tests that exercise the full matrix of recursive vs. non-recursive patterns, directory-depth mismatches, or patterns ending in /*.

Leaving these gaps risks regressions and unexpected traversal behaviour.

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Tasks

• Implement ** handling in _should_exclude

  • Understand if this is needed.

• Design unit-test matrix for glob behaviour

  • Include/Exclude | Recursive (**) vs. Fixed-depth | Ends with /* | Depth overflow.

• Add negative tests ensuring that directory paths are not emitted when no files under them match.