Use parent run summary for single-host watcher completion

- update the non-categorized watcher path to fall back to the parent Cloud Run Finished summary when only the final check-xml-files reporter XML is available
- prevent single-host runs from being marked TERMINATED without host results when the controller log already contains the real host outcome
- allow the watcher to populate host results and post Mattermost successfully for completed single-host runs with reused build names

atvm/watcher-service/atvm_run_watcher.py

@@ -339,6 +339,13 @@ def extract_completed_subrun_summaries(log_text: str, inventory: Dict[str, str])
     return summaries
 
 
+def extract_latest_run_summary(log_text: str, inventory: Dict[str, str]) -> Optional[Dict[str, object]]:
+    summaries = extract_completed_subrun_summaries(log_text, inventory)
+    if not summaries:
+        return None
+    return summaries[-1]
+
+
 def collect_host_results(
     reporter_root: Path,
     expected_hosts: List[str],
@@ -1022,6 +1029,27 @@ def determine_state(
                 }
             )
 
+        # Non-categorized runs often only write a final check-xml reporter XML.
+        # Fall back to the parent "Cloud Run Finished" summary when host XML is absent.
+        if not parent_host_results:
+            latest_summary = extract_latest_run_summary(log_text, inventory)
+            if latest_summary:
+                summary_results = latest_summary["host_results"]
+                for host, result in summary_results.items():
+                    parent_host_results[host] = result
+                if subrun_states:
+                    subrun = subrun_states[-1]
+                    subrun["host_results"] = summary_results
+                    if not subrun.get("currents_url") and latest_summary.get("currents_url"):
+                        subrun["currents_url"] = latest_summary["currents_url"]
+                    notes_list = list(subrun.get("notes", []))
+                    fallback_note = "Host result details were derived from the parent run log summary."
+                    if fallback_note not in notes_list:
+                        notes_list.append(fallback_note)
+                    subrun["notes"] = notes_list
+                    if subrun["state"] in {"UNKNOWN", "TERMINATED"}:
+                        subrun["state"] = "FAILED" if any(result.failures for result in summary_results.values()) else "COMPLETED"
+
     parent_start_candidates = [subrun["start_ts"] for subrun in subrun_states if subrun["start_ts"]]
     parent_end_candidates = [subrun["end_ts"] for subrun in subrun_states if subrun["end_ts"]]
     start_ts = min(parent_start_candidates) if parent_start_candidates else started_at