feat(dap): introduced Debug Adapter Protocol tool for launch/attach debugging with breakpoints and inspection
- Added Debug Adapter Protocol (DAP) tool enabling launch/attach debugging with breakpoint management, stepping, stack traces, and variable inspection.
- Added debug adapter configurations for gdb, lldb-dap, debugpy, and dlv with automatic language and project detection via root markers.
- Added debug session management with conditional breakpoints, flow control (continue/step/pause), scopes, variables, and expression evaluation.
- Added `debug.enabled` setting to control debug tool availability and integrated debug tool into agent's builtin tools registry.
- Added environment variable configuration (TERM, GPG_TTY, NO_COLOR, PYTHONUNBUFFERED) to prevent terminal blocking in non-interactive execution.
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