Add scene fragments to portrait prompts after clothing.

Thing, room, yard and climate precipitation can contribute a short prompt when they are in frame, with a budget so chairs stay silent.

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

src/HSchool.Content/PromptContribution.cs

@@ -0,0 +1,61 @@
+namespace HSchool.Content;
+
+/// <summary>One LoRA or embedding a scene def may add to a portrait. Empty name is ignored.</summary>
+public sealed class PromptLoraRef
+{
+    public string Name { get; init; } = "";
+
+    public float Weight { get; init; } = 1f;
+}
+
+/// <summary>
+/// Optional portrait-prompt fragment on a thing, room, yard or precipitation. Missing or empty
+/// means the def is silent — a chair does not name itself in the prompt.
+/// </summary>
+public sealed class PromptContribution
+{
+    public string Positive { get; init; } = "";
+
+    public string Negative { get; init; } = "";
+
+    public float Weight { get; init; } = 1f;
+
+    public IReadOnlyList<PromptLoraRef> PositiveLoras { get; init; } = [];
+
+    public IReadOnlyList<PromptLoraRef> NegativeLoras { get; init; } = [];
+
+    public IReadOnlyList<PromptLoraRef> PositiveEmbeddings { get; init; } = [];
+
+    public IReadOnlyList<PromptLoraRef> NegativeEmbeddings { get; init; } = [];
+
+    public bool IsSilent =>
+        string.IsNullOrWhiteSpace(Positive)
+        && string.IsNullOrWhiteSpace(Negative)
+        && !HasNamed(PositiveLoras)
+        && !HasNamed(NegativeLoras)
+        && !HasNamed(PositiveEmbeddings)
+        && !HasNamed(NegativeEmbeddings);
+
+    private static bool HasNamed(IReadOnlyList<PromptLoraRef> entries)
+    {
+        foreach (var entry in entries)
+        {
+            if (!string.IsNullOrWhiteSpace(entry.Name))
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
+
+/// <summary>Clear / rain / snow fragments on a climate preset. Outdoor portraits pick one.</summary>
+public sealed class ClimatePromptSet
+{
+    public PromptContribution? Clear { get; init; }
+
+    public PromptContribution? Rain { get; init; }
+
+    public PromptContribution? Snow { get; init; }
+}