## ADDED Requirements

### Requirement: MarkExplicit accepts multiple packages
The MarkExplicit method SHALL accept a slice of package names and mark all of them as explicitly installed using a single pacman -D call.

#### Scenario: Single package marked explicit
- **WHEN** MarkExplicit is called with one package name
- **THEN** pacman -D --explicit is called once with that package

#### Scenario: Multiple packages marked explicit
- **WHEN** MarkExplicit is called with multiple package names (e.g., ["pkg1", "pkg2"])
- **THEN** pacman -D --explicit is called once with all packages as arguments

#### Scenario: Empty package slice
- **WHEN** MarkExplicit is called with an empty slice
- **THEN** no pacman call is made, method returns nil immediately