Revert "Remove character description global prompt prefixing"

This reverts commit 5347ca3dbc.

ltx_director.py

@@ -375,6 +375,29 @@ def _character_prompt_replacements(characters: list[dict]) -> dict[str, str]:
     return replacements
 
 
+def _prepend_referenced_character_descriptions(
+    global_prompt: str,
+    local_prompts: str,
+    characters: list[dict] | None = None,
+) -> str:
+    prompt_text = f"{global_prompt or ''} {local_prompts or ''}"
+    descriptions = []
+    for character, tags in zip(characters or [], _build_character_tag_groups(characters or [])):
+        description = (character.get("description", "") or "").strip()
+        if not description:
+            continue
+        if any(tag in prompt_text for tag in tags):
+            descriptions.append(description)
+
+    if not descriptions:
+        return global_prompt or ""
+
+    prefix = ". ".join(descriptions)
+    if not (global_prompt or "").strip():
+        return prefix
+    return f"{prefix}. {global_prompt.strip()}"
+
+
 def _preprocess_prompts_with_characters(global_prompt, local_prompts, characters: list[dict] | None = None):
     """Invisibly swaps out @characterN/@charN/@alias tags with their character descriptions."""
     if "@" not in (global_prompt or "") and "@" not in (local_prompts or ""):
@@ -2084,6 +2107,7 @@ class LTXDirector(io.ComfyNode):
             image_cache=image_cache,
             input_dir=input_dir,
         )
+        global_prompt = _prepend_referenced_character_descriptions(global_prompt, local_prompts, characters)
         char_slot_images = [list(character.get("images") or []) for character in characters]
         char_images = [img for slot_images in char_slot_images for img in slot_images]