feat(site-runtime): ScriptRun rows carry exception detail; per-run log line cap + closing row (D3/D7)

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/SiteRuntimeOptions.cs

@@ -243,4 +243,18 @@ public class SiteRuntimeOptions
     /// Default: 30.
     /// </summary>
     public int TraceArmWindowSeconds { get; set; } = 30;
+
+    /// <summary>
+    /// Flow Debugger step logs (design 2026-09-09 D7): the maximum number of <c>ScriptLog</c>
+    /// trace rows ONE script run may produce — the author's own <c>Log.*</c> lines plus the
+    /// runtime lines captured while the run is traced. Lines past the cap are counted and
+    /// dropped, and the run emits one closing <c>warn</c> row naming the dropped count, so a
+    /// chatty script degrades to a truncated log instead of an unbounded row stream.
+    ///
+    /// <para>The cap is per RUN, not per script: an inline shared script shares its caller's
+    /// logger and therefore its counter. It only bounds trace rows — every line still reaches
+    /// the node's <c>ILogger</c>, traced or not — and an untraced run produces no rows at all.
+    /// Must be greater than 0. Default: 200.</para>
+    /// </summary>
+    public int MaxLogLinesPerRun { get; set; } = 200;
 }