Robespierre should be able to ignore file patterns

Robespierre should be able to ignore file patterns, in command line options to begin with.

ie: `--ignored-files "test-setup/*.ts"`

Start by locating Robespierre's command-line option parsing and the code that walks or analyzes files. Trace how a pattern such as `test-setup/*.ts` could be applied before dependency analysis, then inspect any existing CLI tests or usage documentation. Done means the option is accepted and matching files are excluded from the reported dependencies.

Written by the indexing model from the issue text.