fix(deploymentmanager): bulk deploy skips Disabled + reconcile circuit-breaker + probe captures pre-flatten versions (arch-review 2026-08-19 P7-2 + P7-3 + P7-4)

src/ZB.MOM.WW.ScadaBridge.DeploymentManager/FlattenSession.cs

@@ -86,6 +86,23 @@ public sealed class FlattenSession
     /// </summary>
     public IReadOnlyCollection<int> VisitedTemplateIds => _templates.Keys;
 
+    /// <summary>
+    /// Every visited template id paired with the watermark version this session
+    /// READ it at — the pre-flatten watermark the staleness fast path must memoise
+    /// against.
+    ///
+    /// <para>
+    /// Re-reading the versions after the flatten instead is a correctness bug, not
+    /// an optimisation detail: an edit that lands mid-flatten pairs the PRE-edit
+    /// content (and therefore the pre-edit hash) with the POST-edit version, and
+    /// the memo then answers "not stale" until something else moves the watermark.
+    /// Recording the version each template was read at can only ever cause an extra
+    /// flatten, never a stale answer.
+    /// </para>
+    /// </summary>
+    public IReadOnlyDictionary<int, long> VisitedTemplateVersions =>
+        _templates.ToDictionary(entry => entry.Key, entry => entry.Value.Version);
+
     /// <summary>
     /// Returns the inheritance chain for <paramref name="templateId"/> (the
     /// template itself, then each ancestor), loading it through