atlasbot: add fact-pack fallback for fast

services/comms/scripts/atlasbot/bot.py

@@ -3823,6 +3823,37 @@ def _has_body_lines(answer: str) -> bool:
     return False
 
 
+def _fallback_fact_answer(prompt: str, context: str) -> str:
+    facts: list[str] = []
+    for line in (context or "").splitlines():
+        trimmed = line.strip()
+        if not trimmed.startswith("F"):
+            continue
+        if ":" not in trimmed:
+            continue
+        fact = trimmed.split(":", 1)[1].strip()
+        if fact.startswith("-"):
+            fact = fact.lstrip("-").strip()
+        if fact:
+            facts.append(fact)
+    if not facts:
+        return ""
+    tokens = set(_tokens(prompt))
+    best_fact = ""
+    best_score = -1
+    for fact in facts:
+        score = len(tokens & set(_tokens(fact)))
+        if score > best_score:
+            best_score = score
+            best_fact = fact
+    if best_score <= 0:
+        return ""
+    sentence = f"Based on the snapshot, {best_fact}"
+    if not sentence.endswith((".", "!", "?")):
+        sentence += "."
+    return sentence
+
+
 def _open_ended_fast_single(
     prompt: str,
     *,
@@ -3849,6 +3880,10 @@ def _open_ended_fast_single(
             system_override=_open_ended_system(),
             model=model,
         )
+    if not _has_body_lines(reply):
+        fallback = _fallback_fact_answer(prompt, context)
+        if fallback:
+            reply = fallback
     if state:
         state.update("done", step=_open_ended_total_steps("fast"))
     return _ensure_scores(reply)