refactor: comprehensive codebase improvements and documentation

- Enhanced error handling with expanded GhostError variants and From impls
- Fixed race conditions in TUI (ui.rs unwrap calls)
- Added comprehensive module documentation with doc comments
- Improved type safety with proper validation in DetectionConfig
- Implemented Linux process enumeration via procfs
- Refactored TUI for better state management and removed emojis
- Enhanced CLI with proper logging initialization
- Added example configuration file (examples/ghost.toml)
- Updated README with complete feature documentation
- Added performance optimizations (saturating arithmetic, reduced clones)
- Improved testing framework with proper struct initialization
- Added validation and preset modes to DetectionConfig

ghost-cli/Cargo.toml

@@ -12,3 +12,4 @@ env_logger.workspace = true
 log.workspace = true
 serde.workspace = true
 serde_json.workspace = true
+clap = { version = "4.0", features = ["derive"] }