fix: address code review feedback

- Add exception handling in run_pipeline to catch unexpected errors
- Remove dead code in THTest (self.name check that never executes)
- Add timeout and concurrency limit tests to test_textfx_runtime_limits.py

konabot/plugins/handle_text/base.py

@@ -563,12 +563,20 @@ class PipelineRunner:
         results: list[TextHandleResult] = []
 
         for statement in pipeline.statements:
-            if isinstance(statement, IfNode):
-                results.append(await self._execute_if(statement, istream, env))
-            elif isinstance(statement, WhileNode):
-                results.append(await self._execute_while(statement, istream, env))
-            else:
-                results.append(await self._execute_group(statement, istream, env))
+            try:
+                if isinstance(statement, IfNode):
+                    results.append(await self._execute_if(statement, istream, env))
+                elif isinstance(statement, WhileNode):
+                    results.append(await self._execute_while(statement, istream, env))
+                else:
+                    results.append(await self._execute_group(statement, istream, env))
+            except Exception as e:
+                logger.error(f"Pipeline execution failed: {e}")
+                logger.exception(e)
+                results.append(
+                    TextHandleResult(code=-1, ostream="处理流水线时出现 python 错误")
+                )
+                return results
 
         return results
 

konabot/plugins/handle_text/handlers/unix_handlers.py

@@ -118,9 +118,8 @@ class THTest(TextHandler):
         self, env: TextHandlerEnvironment, istream: str | None, args: list[str]
     ) -> TextHandleResult:
         expr = list(args)
-        if self.name == "[":
-            pass
 
+        # 支持方括号语法：[ expr ] 会自动移除末尾的 ]
         if expr and expr[-1] == "]":
             expr = expr[:-1]