Install debugging tools: GDB for C++ and PDB for Python

[Copilot]

This PR adds installation support for debugging tools as requested in the issue:

Changes Made

GDB (GNU Debugger) for C++:

• Created script/install.d/15-debug.sh that automatically installs GDB
• Supports cross-platform installation via apt (Linux) and brew (macOS)
• Only installs if GDB is not already present on the system
• Reports GDB version after successful installation/detection

PDB (Python Debugger):

• Verified PDB availability as Python built-in module (no separate installation needed)
• Script confirms PDB is accessible and documents this fact
• No additional installation required since it's part of Python standard library

Testing Integration:

• Added gdb to the binary test suite in tests/test_binaries.py
• Ensures GDB is properly detected in PATH after installation
• Follows existing test patterns for binary verification

Usage

The debugging tools can be installed by running:

./script/install 15-debug

Or as part of the full installation:

./script/install

The script provides informative output:

GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
PDB (Python debugger) is available as built-in module

Implementation Details

• Follows existing repository patterns for cross-platform package installation
• Uses conditional installation to avoid unnecessary operations
• Minimal changes with only 2 files modified/added
• Properly handles cases where tools are already installed or dependencies are missing

Fixes #8.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.