Add live debugger frontend and mutex stall recovery (#383)

src/SharpEmu.Debugger/Session/IDebuggerSession.cs

@@ -0,0 +1,43 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using SharpEmu.Core.Cpu.Debugging;
+using SharpEmu.Debugger.Breakpoints;
+
+namespace SharpEmu.Debugger.Session;
+
+/// <summary>
+/// The debugger's coordination point. It bridges the CPU dispatcher seam
+/// (<see cref="Hook"/>) to the inspection surface (<see cref="IDebugTarget"/>),
+/// owns breakpoint state, and raises lifecycle events that a server relays to
+/// connected clients.
+/// </summary>
+public interface IDebuggerSession : IDebugTarget
+{
+    /// <summary>The breakpoints armed for this session.</summary>
+    BreakpointStore Breakpoints { get; }
+
+    /// <summary>
+    /// The dispatcher-facing hook. Assign this to
+    /// <c>SharpEmuRuntimeOptions.DebugHook</c> so guest frames are routed through
+    /// the session.
+    /// </summary>
+    ICpuDebugHook Hook { get; }
+
+    /// <summary>Raised on the emulation thread each time the target stops.</summary>
+    event EventHandler<DebugStopEvent>? Stopped;
+
+    /// <summary>Raised when a paused target resumes.</summary>
+    event EventHandler? Resumed;
+
+    /// <summary>Raised once the target has terminated.</summary>
+    event EventHandler? Terminated;
+
+    /// <summary>
+    /// Signals that the guest run has finished. Releases any parked emulation
+    /// thread and transitions the session to
+    /// <see cref="DebuggerRunState.Terminated"/>. Hosts call this after the
+    /// runtime returns.
+    /// </summary>
+    void NotifyTerminated();
+}