feat: introduce slash commands, token tracking, context compaction, grep_recursive tool, and update README with new features and project structure.

Tools/EditTools.cs

@@ -10,7 +10,7 @@ namespace AnchorCli.Tools;
 /// On success, returns "OK fp:{fingerprint}" so the model can verify the mutation.
 /// On failure, returns a descriptive ERROR string — no exceptions reach the LLM.
 /// </summary>
-internal static class EditTools
+internal static partial class EditTools
 {
     public static Action<string> Log { get; set; } = Console.WriteLine;
 
@@ -19,7 +19,7 @@ internal static class EditTools
     /// Format: "lineNumber:hexHash|" e.g. "5:a3|"
     /// </summary>
     private static readonly Regex HashlinePrefix =
-        new(@"^\d+:[0-9a-fA-F]{2}\|", RegexOptions.Compiled);
+        MyRegex();
 
     /// <summary>
     /// Strips accidental hashline prefixes from lines the LLM sends as new content.
@@ -328,4 +328,7 @@ internal static class EditTools
             return $"ERROR appending to '{path}': {ex.Message}";
         }
     }
+
+    [GeneratedRegex(@"^\d+:[0-9a-fA-F]{2}\|", RegexOptions.Compiled)]
+    private static partial Regex MyRegex();
 }