test: update smoke and regression suites for dual-renderer paths

Offscreen harnesses now resize+show before load, use per-instance webengine profile dirs and explicit exit codes; compaction and bash stream suites follow the renamed internals.

tests/test_compaction_persist.py

@@ -173,7 +173,9 @@ _mw_path = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__
                         "ui", "views", "main_window.py")
 with open(_mw_path, "r", encoding="utf-8") as f:
     _src = f.read()
-check("T9.渲染过滤含 compaction", 'msg["role"] not in ("system", "compaction")' in _src)
+# 注意：探针与循环变量名解耦（源码列表推导式用 `m` 或 `msg` 均可），
+# 只锁死“渲染过滤排除 system/compaction”这一语义。
+check("T9.渲染过滤含 compaction", '["role"] not in ("system", "compaction")' in _src)
 
 # ---------- T12：Fix A — 摘要条目 timestamp → P0 失效过期锚点 ----------
 # 场景（长程会话 92.7k→11k）：保留行里 assistant 的入库 usage 是压缩前快照；