Update documentation for wsssht refactoring

- Updated README.md project structure to reflect new libwsssht/ modular organization
- Updated DOCUMENTATION.md with new modular component descriptions
- Added CHANGELOG.md entry for version 1.6.1 with refactoring details
- Added TODO.md entry documenting the completed refactoring work

All documentation now reflects the new modular architecture with improved maintainability.

CHANGELOG.md

@@ -5,6 +5,25 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.6.1] - 2025-09-18
+
+### Changed
+- **Major Code Refactoring**: Complete modularization of `wsssht.c` for improved maintainability
+  - Split monolithic 2769-line `wsssht.c` into modular components in `libwsssht/` directory
+  - Created `utils.h/c`: Utility functions (print_usage, parse_connection_string, parse_args)
+  - Created `modes.h/c`: Mode-specific functions (bridge, script, daemon modes)
+  - Created `threads.h/c`: Thread-related functions and structures
+  - Created `wsssht.h`: Main header with includes and declarations
+  - Reduced main `wsssht.c` to 674 lines (75% size reduction)
+  - Maintained 100% backward compatibility and functionality
+
+### Technical Details
+- **Modular Architecture**: Clean separation of concerns with focused, single-responsibility modules
+- **Build System Updates**: Updated `configure.sh` and `Makefile` to handle new modular structure
+- **Code Organization**: Improved developer experience with logical code grouping
+- **Maintainability**: Easier debugging, testing, and feature development
+- **Documentation**: Updated build system documentation for new structure
+
 ## [1.6.0] - 2025-09-18
 
 ### Added

DOCUMENTATION.md

@@ -797,7 +797,7 @@ wsssh/
 ├── static/            # Web assets
 ├── wssshtools/        # C implementation directory
 │   ├── wssshc.c       # C client for registration
-│   ├── wsssh.c        # C SSH wrapper
+│   ├── wsssh.c        # C SSH wrapper (main function only)
 │   ├── wsscp.c        # C SCP wrapper
 │   ├── wssshlib.h     # Shared utilities library header
 │   ├── wssshlib.c     # Shared utilities library implementation
@@ -807,8 +807,16 @@ wsssh/
 │   ├── wssh_ssl.c     # SSL functions library implementation
 │   ├── tunnel.h       # Tunnel management library header
 │   ├── tunnel.c       # Tunnel management library implementation
-│   ├── configure.sh   # Build configuration
-│   ├── Makefile       # GNU Make build system
+│   ├── libwsssht/     # Modular wsssht components (v1.6.1)
+│   │   ├── wsssht.h   # Main wsssht header with declarations
+│   │   ├── utils.h    # Utility functions header
+│   │   ├── utils.c    # Utility implementations (print_usage, parse_args)
+│   │   ├── modes.h    # Operating mode functions header
+│   │   ├── modes.c    # Mode implementations (bridge, script, daemon)
+│   │   ├── threads.h  # Thread functions header
+│   │   └── threads.c  # Thread implementations and structures
+│   ├── configure.sh   # Build configuration (updated for modular structure)
+│   ├── Makefile       # GNU Make build system (updated for modular structure)
 │   ├── common.c       # Common utilities
 │   └── debian/        # Debian packaging for wsssh-tools
 │       ├── control    # Package metadata

README.md

@@ -564,7 +564,7 @@ wsssh/
 ├── static/            # Static web assets
 ├── wssshtools/        # C implementation directory
 │   ├── wssshc.c       # C client for registration
-│   ├── wsssh.c        # C SSH wrapper
+│   ├── wsssh.c        # C SSH wrapper (main function only)
 │   ├── wsscp.c        # C SCP wrapper
 │   ├── wssshlib.h     # Shared utilities library header
 │   ├── wssshlib.c     # Shared utilities library implementation
@@ -574,9 +574,17 @@ wsssh/
 │   ├── wssh_ssl.c     # SSL functions library implementation
 │   ├── tunnel.h       # Tunnel management library header
 │   ├── tunnel.c       # Tunnel management library implementation
+│   ├── libwsssht/     # Modular wsssht components (v1.6.1)
+│   │   ├── wsssht.h   # Main wsssht header with declarations
+│   │   ├── utils.h    # Utility functions header
+│   │   ├── utils.c    # Utility implementations (print_usage, parse_args)
+│   │   ├── modes.h    # Operating mode functions header
+│   │   ├── modes.c    # Mode implementations (bridge, script, daemon)
+│   │   ├── threads.h  # Thread functions header
+│   │   └── threads.c  # Thread implementations and structures
 │   ├── common.c       # Common utilities
-│   ├── configure.sh   # C build configuration
-│   ├── Makefile       # C build system
+│   ├── configure.sh   # C build configuration (updated for modular structure)
+│   ├── Makefile       # C build system (updated for modular structure)
 │   └── debian/        # Debian packaging
 │       ├── control    # Package metadata
 │       ├── rules      # Build rules

TODO.md

 # WebSocket SSH - Future Enhancements Roadmap
 
+## Recently Completed (v1.6.1)
+- [x] **Major Code Refactoring**: Complete modularization of `wsssht.c` for improved maintainability
+  - Split monolithic 2769-line `wsssht.c` into modular components in `libwsssht/` directory
+  - Created `utils.h/c`: Utility functions (print_usage, parse_connection_string, parse_args)
+  - Created `modes.h/c`: Mode-specific functions (bridge, script, daemon modes)
+  - Created `threads.h/c`: Thread-related functions and structures
+  - Created `wsssht.h`: Main header with includes and declarations
+  - Reduced main `wsssht.c` to 674 lines (75% size reduction)
+  - Updated `configure.sh` and `Makefile` to handle new modular structure
+  - Maintained 100% backward compatibility and functionality
+  - Improved developer experience with logical code grouping
+  - Easier debugging, testing, and feature development
+
 ## Recently Completed (v1.6.0)
 - [x] **Multiple Operating Modes**: Complete implementation of various operating modes for wsssht
   - **Interactive Mode**: Standard interactive SSH/SCP sessions (default)