Strengthen H3 reference prompt placement

dumas_h3_longvideos.py

@@ -4416,19 +4416,15 @@ def _inject_reference_context(block, context):
     text = str(block or "").strip()
     if not text:
         return context
-    match = re.match(r"^(\[Generation \d+\]\s*)(.*)$", text, re.S)
+    match = re.match(r"^(\[Generation \d+\]\s*)", text)
     if not match:
         return f"{context} {text}".strip()
-    prefix, body = match.groups()
-    body = body.strip()
-    split_at = body.find(". ")
-    if split_at == -1:
-        return f"{prefix}{body} {context}".strip()
-    anchor = body[: split_at + 1]
-    rest = body[split_at + 2 :].strip()
-    if not rest:
-        return f"{prefix}{anchor} {context}".strip()
-    return f"{prefix}{anchor} {context} {rest}".strip()
+    return re.sub(
+        r"^(\[Generation \d+\]\s*)",
+        lambda m: m.group(1) + context + " ",
+        text,
+        count=1,
+    )
 
 
 def _reference_character_memory(ref_slots):