hdb> break 0x401176
hdb> run
hdb> regs
hdb> continue
hdb> quit

src/
├── main.cpp                     # Entry point, fork, main loop
├── core/
│   ├── debugger.cpp/h           # Debugger state and ptrace calls
│   └── breakpoint.cpp/h         # INT3 breakpoint logic
├── registry/
│   ├── command_registry.cpp/h   # Maps names → commands
│   └── command_factory.cpp/h    # Creates all command objects
└── commands/
    ├── command.h                # Abstract Command interface
    ├── run_command.cpp/h        # Start program execution
    ├── continue_command.cpp/h   # Continue after breakpoint
    ├── step_command.cpp/h       # Single instruction step
    ├── add_breakpoint_command.cpp/h
    ├── remove_breakpoint_command.cpp/h
    ├── list_breakpoints_command.cpp/h
    ├── display_registers_command.cpp/h
    ├── help_command.cpp/h
    └── quit_command.cpp/h