fix: 将所有emoji/Unicode特殊字符替换为ASCII安全字符

Windows cmd/PowerShell默认codepage下emoji显示为?号。
全局替换: 👋->移除, 💭->[Thinking], ⚙->*, ✓->[OK], ✗->[FAIL],
◆->>, ⚠->[!], ✅->[OK], •->|/-, →->>>, ✏️->[Edit]等。
❯保留（windows-vtp终端下正常显示）。

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/main/java/com/claudecode/tool/impl/FileEditTool.java

@@ -87,7 +87,7 @@ public class FileEditTool implements Tool {
             long oldLines = oldString.lines().count();
             long newLines = newString.lines().count();
 
-            return "✅ Edited " + path + " (replaced " + oldLines + " lines with " + newLines + " lines)";
+            return "[OK] Edited " + path + " (replaced " + oldLines + " lines with " + newLines + " lines)";
 
         } catch (IOException e) {
             return "Error editing file: " + e.getMessage();
@@ -96,6 +96,6 @@ public class FileEditTool implements Tool {
 
     @Override
     public String activityDescription(Map<String, Object> input) {
-        return "✏️ Editing " + input.getOrDefault("file_path", "file");
+        return "[Edit] " + input.getOrDefault("file_path", "file");
     }
 }