feat: Implement a modular skill system with hotword detection, streaming text output, and enhanced logging.

Core/Skills/SkillRegistry.cs

@@ -0,0 +1,29 @@
+namespace Toak.Core.Skills;
+
+public static class SkillRegistry
+{
+    public static readonly ISkill[] AllSkills = new ISkill[]
+    {
+        new TerminalSkill(),
+        new TranslateSkill()
+    };
+    
+    public static ISkill? DetectSkill(string transcript, IEnumerable<string> activeSkillNames)
+    {
+        var activeSkills = AllSkills.Where(s => activeSkillNames.Contains(s.Name, StringComparer.OrdinalIgnoreCase)).ToList();
+
+        string normalizedTranscript = transcript.Trim();
+        
+        foreach (var skill in activeSkills)
+        {
+            foreach (var hotword in skill.Hotwords)
+            {
+                if (normalizedTranscript.StartsWith(hotword, StringComparison.OrdinalIgnoreCase))
+                {
+                    return skill;
+                }
+            }
+        }
+        return null;
+    }
+}