answer: derive non-rpi nodes from snapshot

atlasbot/engine/answerer.py

@@ -532,6 +532,11 @@ class AnswerEngine:
                     model=plan.model,
                     tag="evidence_fix",
                 )
+
+            if "raspberry" in lowered_question and "not" in lowered_question:
+                non_rpi = _non_rpi_nodes(summary)
+                if non_rpi:
+                    reply = _format_hardware_groups(non_rpi, "Non-Raspberry Pi nodes")
                 if unknown_nodes or unknown_namespaces:
                     refreshed_nodes = _find_unknown_nodes(reply, allowed_nodes)
                     refreshed_namespaces = _find_unknown_namespaces(reply, allowed_namespaces)
@@ -1639,6 +1644,31 @@ def _line_starting_with(lines: list[str], prefix: str) -> str | None:
     return None
 
 
+def _non_rpi_nodes(summary: dict[str, Any]) -> dict[str, list[str]]:
+    hardware = summary.get("hardware_by_node") if isinstance(summary, dict) else None
+    if not isinstance(hardware, dict):
+        return {}
+    grouped: dict[str, list[str]] = {}
+    for node, hw in hardware.items():
+        if not isinstance(node, str) or not isinstance(hw, str):
+            continue
+        if hw.startswith("rpi"):
+            continue
+        grouped.setdefault(hw, []).append(node)
+    for nodes in grouped.values():
+        nodes.sort()
+    return grouped
+
+
+def _format_hardware_groups(groups: dict[str, list[str]], label: str) -> str:
+    if not groups:
+        return ""
+    parts = []
+    for hw, nodes in sorted(groups.items()):
+        parts.append(f"{hw} ({', '.join(nodes)})")
+    return f\"{label}: \" + \"; \".join(parts) + \".\"
+
+
 def _lexicon_context(summary: dict[str, Any]) -> str:  # noqa: C901
     if not isinstance(summary, dict):
         return ""