Add batch pacman checks and package resolution specs

openspec/changes/batch-pacman-checks/specs/dry-run-simulation/spec.md

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+## ADDED Requirements
+
+### Requirement: Dry-run shows packages to install without making changes
+In dry-run mode, the system SHALL compute what WOULD happen without executing any pacman operations.
+
+#### Scenario: Dry-run lists packages to install
+- **WHEN** dry-run is enabled and packages need to be installed
+- **THEN** the system SHALL populate `Result.ToInstall` with all packages that would be installed (both sync and AUR)
+
+#### Scenario: Dry-run lists packages to remove
+- **WHEN** dry-run is enabled and orphan packages exist
+- **THEN** the system SHALL NOT calculate or populate `Result.ToRemove` - orphan detection is skipped entirely in dry-run mode
+
+#### Scenario: Dry-run skips pacman sync
+- **WHEN** dry-run is enabled
+- **THEN** the system SHALL NOT execute `pacman -Syu` for package installation
+
+#### Scenario: Dry-run skips explicit/deps marking
+- **WHEN** dry-run is enabled
+- **THEN** the system SHALL NOT execute `pacman -D --asdeps` or `pacman -D --asexplicit`
+
+#### Scenario: Dry-run skips orphan cleanup
+- **WHEN** dry-run is enabled
+- **THEN** the system SHALL NOT execute `pacman -Rns` for orphan removal
+
+#### Scenario: Dry-run outputs count summary
+- **WHEN** dry-run is enabled
+- **THEN** the system SHALL still compute and output `Result.Installed` and `Result.Removed` counts as if the operations had run