Sample outdoor weather from the climate preset so people can freeze and the clock can show it.

Protocol v8 adds tenths of a °C and precipitation to the clock frame; warmth drains from insulation versus place temperature.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/HSchool.Simulation/PersonInsulation.cs

@@ -0,0 +1,73 @@
+using HSchool.Content;
+using HSchool.People;
+
+namespace HSchool.Simulation;
+
+/// <summary>
+/// Worn insulation in °C-equivalent points, summed from apparel currently on the body.
+/// Tests that need a bare frost set <see cref="Naked"/> on the entity explicitly.
+/// </summary>
+public readonly record struct PersonInsulation(float Value)
+{
+    public static PersonInsulation Naked { get; } = new(0f);
+
+    public static PersonInsulation FromWorn(DefCatalog catalog, params string[] defNames)
+    {
+        ArgumentNullException.ThrowIfNull(catalog);
+        var sum = 0f;
+        foreach (var name in defNames)
+        {
+            if (catalog.Things.TryGetValue(name, out var thing) && thing.Layers.Count > 0)
+            {
+                sum += thing.Insulation;
+            }
+        }
+
+        return new PersonInsulation(sum);
+    }
+
+    public static PersonInsulation FromPerson(Person person, DefCatalog? catalog)
+    {
+        ArgumentNullException.ThrowIfNull(person);
+        if (catalog is null)
+        {
+            return Naked;
+        }
+
+        var worn = WornDefs(person);
+        return worn.Count == 0 ? Naked : FromWorn(catalog, [.. worn]);
+    }
+
+    private static List<string> WornDefs(Person person)
+    {
+        var worn = new List<string>();
+        if (person.GetType().GetProperty("Items")?.GetValue(person) is not System.Collections.IEnumerable items)
+        {
+            return worn;
+        }
+
+        foreach (var item in items)
+        {
+            if (item is null)
+            {
+                continue;
+            }
+
+            var type = item.GetType();
+            var def = type.GetProperty("Def")?.GetValue(item) as string;
+            var location = type.GetProperty("Location")?.GetValue(item) as string
+                ?? type.GetProperty("Place")?.GetValue(item) as string;
+            if (def is null || location is null)
+            {
+                continue;
+            }
+
+            if (location.Equals("worn", StringComparison.OrdinalIgnoreCase))
+            {
+                worn.Add(def);
+            }
+        }
+
+        return worn;
+    }
+}