把存储的 yaw 上限归一到 ±180

yaw 台转 ±180，实测点的第二组精确解落在 118° 之外：旧文件里的 ±90 会让求解器把位姿算成可达、运动守卫却拒绝这段 yaw，操作员看到的就是“到不了”。加载时把求解器与守卫两种写法的 yaw 上限一起归一，pitch 包络此前已按同一理由处理。

apps/autocal/src/orisys_autocal/preferences.py

@@ -322,6 +322,13 @@ def load_preferences() -> dict[str, Any]:
     # Yaw travel is ±180. The same-sign pitch solution sits near ±150° of yaw,
     # and a stored ±90 drops it, leaving the opposite pitch sign on one side.
     prefs["finger_yaw_limit_deg"] = float(defaults["finger_yaw_limit_deg"])
+    # The solver's envelope and the move guard's are one bench fact written twice: a
+    # measured point has two exact solutions, the second past 118° of yaw, and a file
+    # saved on the old ±90 would have the solver call a pose reachable while the guard
+    # refused the 118° the move needs. Normalise both spellings, as the pitch envelope
+    # above is normalised, so "cannot reach" can only mean the stage really cannot.
+    if isinstance(limits, dict):
+        limits["max_yaw_deg"] = float(defaults["safety_limits"]["max_yaw_deg"])
     # A hand-edited task number must not reach the controller as typed.
     prefs["bas_task"] = clamp_bas_task(prefs.get("bas_task"))
     prefs = _migrate_axis_roles(prefs)