Implement comprehensive layered architecture for code structure reorganization

- Create trait-based abstractions for common patterns (Command, GitCommand, Destructive)
- Consolidate related functionality into logical modules (core, domain, adapters, commands)
- Improve module organization and reduce coupling with clear layer boundaries
- Better separation of concerns between CLI, business logic, and git operations
- Add comprehensive core utilities (validation, interactive, safety, output buffering)
- Implement domain-driven design with typed request/response objects
- Create adapter layer for CLI-to-domain bridging with factory patterns
- Add examples and documentation for architecture migration patterns

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: simeg

README.md

@@ -6,6 +6,8 @@ It wraps common Git actions in muscle-memory-friendly, no-brainer commands — p
 
 ⚠️ **PSA: Do you know shell tab completion? If so - I need your help! 🙏 See the [Tab Completion](#-tab-completion-) section** ⚠️
 
+![Banner](banner.png)
+
 ---
 
 ## 📚 Table of Contents

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+# Git-X Architecture Documentation
+
+This document describes the new layered architecture implemented for the git-x CLI tool, designed to improve maintainability, testability, and extensibility.
+
+## Architecture Overview
+
+The codebase is now organized into distinct layers with clear responsibilities:
+
+```
+┌─────────────────────┐
+│   CLI Layer         │  ← User interaction, argument parsing
+├─────────────────────┤
+│   Adapter Layer     │  ← Bridges CLI and Domain
+├─────────────────────┤
+│   Domain Layer      │  ← Business logic, workflows
+├─────────────────────┤
+│   Core Layer        │  ← Git operations, utilities
+└─────────────────────┘
+```
+
+## Layer Descriptions
+
+### 1. Core Layer (`src/core/`)
+
+**Purpose**: Low-level utilities and abstractions for git operations.
+
+**Modules**:
+- `traits.rs` - Common trait abstractions (Command, GitCommand, Destructive, etc.)
+- `git.rs` - Git operation wrappers (GitOperations, BranchOperations, etc.)
+- `output.rs` - Output formatting and buffering utilities
+- `validation.rs` - Input validation with security focus
+- `interactive.rs` - Interactive UI utilities with fuzzy search
+- `safety.rs` - Safety mechanisms for destructive operations
+
+**Responsibilities**:
+- Execute git commands safely
+- Provide consistent error handling
+- Handle user input validation
+- Manage interactive prompts
+- Implement safety checks
+
+### 2. Domain Layer (`src/domain/`)
+
+**Purpose**: Business logic and domain-specific workflows.
+
+**Modules**:
+- `git_repository.rs` - Repository-level operations and state
+- `branch_manager.rs` - Branch lifecycle management
+- `commit_manager.rs` - Commit-related operations
+- `analysis_engine.rs` - Repository analysis and reporting
+
+**Responsibilities**:
+- Implement business rules
+- Coordinate complex workflows
+- Provide type-safe APIs
+- Handle domain-specific validation
+- Manage operation state
+
+**Key Concepts**:
+- **Request/Response DTOs**: Strongly-typed data transfer objects
+- **Domain Services**: High-level operation coordinators
+- **Business Rules**: Domain-specific validation and logic
+
+### 3. Adapter Layer (`src/adapters/`)
+
+**Purpose**: Bridge between CLI and domain layers.
+
+**Modules**:
+- `cli_handlers.rs` - CLI command handlers
+- `formatters.rs` - Output formatting for CLI
+
+**Responsibilities**:
+- Convert CLI arguments to domain requests
+- Handle CLI-specific concerns (interactive vs non-interactive)
+- Format domain responses for CLI output
+- Manage CLI workflow coordination
+
+### 4. Command Layer (`src/commands/`)
+
+**Purpose**: Organized command implementations by functional area.
+
+**Modules**:
+- `branch.rs` - Branch-related commands
+- `commit.rs` - Commit-related commands
+- `repository.rs` - Repository-level commands
+- `analysis.rs` - Analysis and reporting commands
+
+### 5. CLI Layer (`src/cli.rs`)
+
+**Purpose**: Command-line interface definition and argument parsing.
+
+**Responsibilities**:
+- Define CLI structure with clap
+- Parse command-line arguments
+- Route commands to appropriate handlers
+- Handle global CLI concerns
+
+## Design Patterns Used
+
+### 1. Command Pattern
+Commands implement the `Command` trait with standardized execution methods.
+
+```rust
+pub trait Command {
+    fn execute(&self) -> Result<String>;
+    fn name(&self) -> &'static str;
+    fn description(&self) -> &'static str;
+}
+```
+
+### 2. Request/Response Pattern
+Domain operations use typed request/response objects:
+
+```rust
+pub struct CreateBranchRequest {
+    pub name: String,
+    pub from: Option<String>,
+    pub create_backup: bool,
+}
+
+pub struct BranchCreationResult {
+    pub branch_name: String,
+    pub backup_branch: Option<String>,
+    pub switched: bool,
+}
+```
+
+### 3. Builder Pattern
+Complex operations use builders for configuration:
+
+```rust
+SafetyBuilder::new("delete branches")
+    .with_backup()
+    .with_confirmation()
+    .execute(|| { /* operation */ })
+```
+
+### 4. Factory Pattern
+Handlers are created through factories:
+
+```rust
+let handler = CliHandlerFactory::create_branch_handler()?;
+```
+
+## Benefits of This Architecture
+
+### 1. **Separation of Concerns**
+- CLI logic separated from business logic
+- Git operations isolated from domain rules
+- Output formatting decoupled from data processing
+
+### 2. **Testability**
+- Each layer can be unit tested independently
+- Domain logic testable without CLI dependencies
+- Mock implementations possible at layer boundaries
+
+### 3. **Maintainability**
+- Changes to git operations don't affect CLI
+- Business logic changes isolated to domain layer
+- Clear responsibility boundaries
+
+### 4. **Type Safety**
+- Strongly-typed request/response objects
+- Compile-time validation of data flow
+- Reduced runtime errors
+
+### 5. **Extensibility**
+- New commands easily added through existing patterns
+- Alternative interfaces (GUI, API) can reuse domain layer
+- Plugin architecture possible
+
+## Migration Strategy
+
+The new architecture coexists with legacy code during transition:
+
+1. **Phase 1**: Core utilities and traits (✅ Complete)
+2. **Phase 2**: Domain layer for key operations (✅ Complete)
+3. **Phase 3**: Adapter layer and CLI handlers (✅ Complete)
+4. **Phase 4**: Migrate existing commands incrementally
+5. **Phase 5**: Remove legacy code
+
+## Usage Examples
+
+### Creating a New Command
+
+1. **Define domain operation** in appropriate manager:
+```rust
+impl BranchManager {
+    pub fn create_feature_branch(&self, request: FeatureBranchRequest) -> Result<FeatureBranchResult> {
+        // Business logic here
+    }
+}
+```
+
+2. **Add CLI handler** method:
+```rust
+impl BranchCliHandler {
+    pub fn handle_feature_branch(&self, name: String) -> Result<String> {
+        let request = FeatureBranchRequest { name };
+        let result = self.branch_manager.create_feature_branch(request)?;
+        Ok(self.formatter.format_feature_result(&result))
+    }
+}
+```
+
+3. **Add CLI command** definition:
+```rust
+#[derive(Subcommand)]
+pub enum BranchCommands {
+    Feature { name: String },
+    // ... other commands
+}
+```
+
+### Testing Domain Logic
+
+```rust
+#[test]
+fn test_branch_creation_validation() {
+    let repo = MockRepository::new();
+    let manager = BranchManager::new(repo);
+    
+    let request = CreateBranchRequest {
+        name: "invalid..name".to_string(),
+        from: None,
+        create_backup: false,
+    };
+    
+    let result = manager.create_branch(request);
+    assert!(result.is_err());
+}
+```
+
+## Code Quality Improvements
+
+### Error Handling
+- Consistent `Result<T>` patterns
+- Domain-specific error types
+- Proper error propagation
+
+### Input Validation
+- Security-focused validation (shell injection prevention)
+- Type-safe validation with clear error messages
+- Validation at appropriate layer boundaries
+
+### Safety Features
+- Destructive operation confirmations
+- Automatic backup creation
+- Working directory state validation
+- Recovery mechanisms
+
+### Performance
+- Output buffering for better performance
+- Optimized git command execution
+- Reduced redundant git calls
+
+## Future Enhancements
+
+The new architecture enables:
+
+1. **Configuration System**: Domain-driven configuration management
+2. **Plugin System**: Extensible command architecture
+3. **API Layer**: REST or GraphQL API using domain layer
+4. **GUI Interface**: Desktop or web interface using domain layer
+5. **Async Operations**: Parallel git operations for better performance
+6. **Caching Layer**: Intelligent caching of git operations
+7. **Event System**: Hook system for operation notifications
+
+## Conclusion
+
+This architecture transformation provides a solid foundation for future development while maintaining backward compatibility. The clear separation of concerns, improved testability, and type safety will significantly improve the long-term maintainability of the git-x project.