fix: remove redundant whitespace check; echo no-arg outputs empty line

konabot/plugins/handle_text/base.py

@@ -189,7 +189,7 @@ class PipelineRunner:
                 i += 1
                 continue
 
-            if c.isspace() or c in "  ":
+            if c.isspace():
                 flush_word()
                 i += 1
                 continue

konabot/plugins/handle_text/handlers/unix_handlers.py

@@ -14,8 +14,7 @@ class THEcho(TextHandler):
         self, env: TextHandlerEnvironment, istream: str | None, args: list[str]
     ) -> TextHandleResult:
         # echo 不读 stdin，只输出参数（Unix 语义）
-        if len(args) == 0:
-            return TextHandleResult(1, "请在 echo 后面添加需要输出的文本")
+        # 无参数时输出空行（与 Unix echo 行为一致）
         return TextHandleResult(0, "\n".join(args))