feat(historian): #691 HistoryRead-Raw ReturnBounds — Part 11 bounding values on every backend

The node manager composes the start/end bounds from each backend's existing raw
reads (one authority, HistoryBounds): at-or-before = a capped reverse read
(native, or ReverseRawReader's walk-back on a forward-only backend — never
AVEVA's synthetic boundary row), at-or-after = a capped forward read. Bounds
count toward NumValuesPerNode, the start bound leads the first page, the end
bound ends the last (carried in the continuation point). Missing bound =
Bad_BoundNotFound (null, at the bound time; one-sided reads ±1 s from the
previous value, Table 1 footnotes a/b). A modified read with ReturnBounds is
Bad_InvalidArgument (Part 11 6.5.3.3).

The .NET SDK's ReadRawModifiedDetails defaults ReturnBounds to TRUE; the
existing tests built details without setting it and now set it false.
Oracle: every row of Part 11 Table 1 over three backend shapes, plus paging
concatenation, ties, Bad bounds, microsecond truncation; conformance pins the
lookup primitives on SqlServer + QuestDB.

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/HistoryPaging.cs

@@ -62,6 +62,10 @@ namespace ZB.MOM.WW.OtOpcUa.OpcUaServer;
 ///     serialized), so a new field with a "none" default is all the versioning it needs.
 /// </param>
 /// <param name="EmptyToTicks">The exclusive upper end of that stretch.</param>
+/// <param name="PendingEndBound">
+///     <see cref="HistoryCursorKind.Raw"/> with <c>ReturnBounds = true</c> only (Gitea #691): the end bound still owed —
+///     Part 11 returns it with the last page. <c>null</c> = bounds not requested.
+/// </param>
 internal sealed record HistoryContinuationState(
     string Tagname,
     DateTime NextStartUtc,
@@ -74,7 +78,8 @@ internal sealed record HistoryContinuationState(
     bool Reverse = false,
     long SegmentWidthTicks = 0,
     long EmptyFromTicks = 0,
-    long EmptyToTicks = 0)
+    long EmptyToTicks = 0,
+    HistoryEndBound? PendingEndBound = null)
 {
     /// <summary>The walk-back hint this cursor carries (#686/#689/#691).</summary>
     public ReverseWalkHint WalkHint => new(SegmentWidthTicks, EmptyFromTicks, EmptyToTicks);