fix(gateway): coerce StreamingConfig booleans and malformed numerics safely

gateway/config.py

@@ -36,6 +36,26 @@ def _coerce_bool(value: Any, default: bool = True) -> bool:
     return is_truthy_value(value, default=default)
 
 
+def _coerce_float(value: Any, default: float) -> float:
+    """Coerce numeric config values, falling back on malformed input."""
+    if value is None:
+        return default
+    try:
+        return float(value)
+    except (TypeError, ValueError):
+        return default
+
+
+def _coerce_int(value: Any, default: int) -> int:
+    """Coerce integer config values, falling back on malformed input."""
+    if value is None:
+        return default
+    try:
+        return int(value)
+    except (TypeError, ValueError):
+        return default
+
+
 def _normalize_unauthorized_dm_behavior(value: Any, default: str = "pair") -> str:
     """Normalize unauthorized DM behavior to a supported value."""
     if isinstance(value, str):
@@ -301,13 +321,13 @@ class StreamingConfig:
         if not data:
             return cls()
         return cls(
-            enabled=data.get("enabled", False),
+            enabled=_coerce_bool(data.get("enabled"), False),
             transport=data.get("transport", "edit"),
-            edit_interval=float(data.get("edit_interval", 1.0)),
-            buffer_threshold=int(data.get("buffer_threshold", 40)),
+            edit_interval=_coerce_float(data.get("edit_interval"), 1.0),
+            buffer_threshold=_coerce_int(data.get("buffer_threshold"), 40),
             cursor=data.get("cursor", " ▉"),
-            fresh_final_after_seconds=float(
-                data.get("fresh_final_after_seconds", 60.0)
+            fresh_final_after_seconds=_coerce_float(
+                data.get("fresh_final_after_seconds"), 60.0
             ),
         )