feat(abstractions): add IAcDreamPlugin, IPluginHost, ILogger

src/AcDream.Plugin.Abstractions/IAcDreamPlugin.cs

@@ -0,0 +1,9 @@
+// src/AcDream.Plugin.Abstractions/IAcDreamPlugin.cs
+namespace AcDream.Plugin.Abstractions;
+
+public interface IAcDreamPlugin
+{
+    void Initialize(IPluginHost host);
+    void Enable();
+    void Disable();
+}

src/AcDream.Plugin.Abstractions/ILogger.cs

@@ -0,0 +1,9 @@
+// src/AcDream.Plugin.Abstractions/ILogger.cs
+namespace AcDream.Plugin.Abstractions;
+
+public interface ILogger
+{
+    void Info(string message);
+    void Warn(string message);
+    void Error(string message, Exception? exception = null);
+}

src/AcDream.Plugin.Abstractions/IPluginHost.cs

@@ -0,0 +1,11 @@
+// src/AcDream.Plugin.Abstractions/IPluginHost.cs
+namespace AcDream.Plugin.Abstractions;
+
+/// <summary>
+/// Entry point for a plugin into the acdream runtime. The surface will grow
+/// across phases as more systems come online. For Phase 1 only ILogger is real.
+/// </summary>
+public interface IPluginHost
+{
+    ILogger Log { get; }
+}

src/AcDream.Plugin.Abstractions/Placeholder.cs

@@ -1,3 +0,0 @@
-// src/AcDream.Plugin.Abstractions/Placeholder.cs
-namespace AcDream.Plugin.Abstractions;
-internal static class Placeholder { }