- Implemented `executors` module for applying manifests with support for directories, files, and links.
- Added `action_plan` module to merge and execute install plans from manifests.
- Introduced `run_sample_install.sh` script for testing installations, including dry-run and real execution.
- Enhanced `pkg6` install logic to resolve and apply action plans.
- Improved manifest management with `save_manifest` and repository-based fetching.
