Fix ATVM watcher truncation after Cloud Run Finished

Adjust parent-run summary parsing so the watcher does not stop at the "Recorded Run" detection log line and miss later host rows in Mattermost status output.

Document the 2026-04-15 failure mode in ATVM run learnings so future watcher/reporting work preserves the broader Cloud Run Finished block parsing rule.

atvm/docs/automation/run-learnings.md

@@ -544,3 +544,12 @@ This file stores run-specific examples only when a run produced a new learning r
   - Match plugin-gated generated-spec branches generically by plugin-bearing gate variable name instead of hardcoding only one template's variable names.
   - Apply the same plugin-branch filtering logic across ATVM templates so new templates do not need one-off watcher fixes.
   - Validate generated-spec `TEST FLOW` against the selected runtime plugin path for reboot and other templates before assuming the generic fix is complete.
+
+## Run Learning: 2026-04-15 (Parent `Cloud Run Finished` parsing must tolerate late host rows after Recorded Run detection)
+- Observed failure mode:
+  - A non-categorized watcher run tested three VMs, but the Mattermost status only showed two hosts.
+  - In the launch log, the parent `Cloud Run Finished` summary printed one host row, then logged `Detected 'Recorded Run' after 'Cloud Run Finished' - results uploaded successfully.`, then printed the remaining host rows.
+  - The watcher treated that detection log line as the end of the summary block, so the merged parent-run summary dropped the later host row.
+- Action for future runs:
+  - Do not stop parent summary parsing at the Recorded Run detection log line.
+  - Bound each `Cloud Run Finished` block by the next run boundary such as the next `Extracted specPattern:` or the next `Cloud Run Finished`, then parse all host rows inside that block.

atvm/watcher-service/atvm_run_watcher.py

@@ -700,24 +700,26 @@ def extract_host_results_from_run_finished_segment(segment_text: str, inventory:
 
 def extract_completed_subrun_summaries(log_text: str, inventory: Dict[str, str]) -> List[Dict[str, object]]:
     summaries: List[Dict[str, object]] = []
-    cloud_blocks = list(
-        re.finditer(
-            r"Cloud Run Finished(.*?)(?:🏁 Recorded Run:\s*(https://\S+)|\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3} - INFO - Detected 'Recorded Run' after 'Cloud Run Finished' - results uploaded successfully\.)",
-            log_text,
-            re.S,
-        )
-    )
+    cloud_starts = [match.start() for match in re.finditer(r"Cloud Run Finished", log_text)]
     previous_block_end = 0
-    for block in cloud_blocks:
-        block_text = block.group(1)
-        currents_url = block.group(2)
-        prior_segment = log_text[previous_block_end:block.start()]
+    for index, block_start in enumerate(cloud_starts):
+        next_cloud_start = cloud_starts[index + 1] if index + 1 < len(cloud_starts) else len(log_text)
+        next_spec_match = re.search(r"^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3} - INFO - Extracted specPattern:", log_text[block_start + 1 :], re.M)
+        block_end = next_cloud_start
+        if next_spec_match:
+            candidate_end = block_start + 1 + next_spec_match.start()
+            if candidate_end < block_end:
+                block_end = candidate_end
+        block_text = log_text[block_start:block_end]
+        currents_match = re.search(r"🏁 Recorded Run:\s*(https://\S+)", block_text)
+        currents_url = currents_match.group(1) if currents_match else None
+        prior_segment = log_text[previous_block_end:block_start]
         detail_source = prior_segment + "\n" + block_text
         host_results = extract_host_results_from_run_finished_segment(block_text, inventory)
         if not host_results:
             host_results = extract_host_results_from_run_finished_segment(prior_segment, inventory)
         if not host_results:
-            previous_block_end = block.end()
+            previous_block_end = block_end
             continue
         for host, result in host_results.items():
             if result.failures:
@@ -728,7 +730,7 @@ def extract_completed_subrun_summaries(log_text: str, inventory: Dict[str, str])
                 "currents_url": currents_url,
             }
         )
-        previous_block_end = block.end()
+        previous_block_end = block_end
     return summaries