feat(historian): #674 HistoryUpdate posture — future-skew bound, Primary gate, SqlServer v1 accepted, QuestDB TTL pin

- HistoryUpdate items with SourceTimestamp > now + ServerHistorian:HistoryUpdateMaxFutureSkew
  (default 1 day, <=0 disables) => BadOutOfRange in the node manager (every backend, never sent);
  clock injected via OtOpcUaNodeManager.Clock (host TimeProvider).
- HistoryUpdate is Primary-only: off-Primary => BadInvalidState per node, after authorization,
  same IDriverPrimaryRoleSource verdict as the native-ack gate; HistoryRead ungated.
- SqlServer: base schema requirement back to v1; SupportsModifiedTrail (v>=2). On v1 with
  AutoCreateSchema=false: writes/reads/events/retention work, modified reads + HistoryUpdate =>
  BadHistoryOperationUnsupported with nothing sent, retention skips SampleModified, one Warning per boot.
- QuestDB integration test pinning wall-clock TTL (far-future row evicts only partitions older
  than the TTL by the wall clock), with a positive control.
- Docs: Historian.md, Configuration.md, security.md, CLAUDE.md (incl. QuestDB retry duplicates,
  #674.4 anonymous-readable trail with ACL off, #674.5 not implemented).

Co-Authored-By: Claude <noreply@anthropic.com>

src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Historian/ServerHistorianOptions.cs

@@ -122,6 +122,16 @@ public sealed class ServerHistorianOptions
     /// </summary>
     public int MaxTimeWeightedRawRows { get; init; } = 1_000_000;
 
+    /// <summary>
+    ///     Gitea #674: how far into the future an OPC UA HistoryUpdate (Insert / Replace / Update) item's
+    ///     <c>SourceTimestamp</c> may lie, measured from the server clock. An item beyond <c>now + skew</c> is refused
+    ///     <c>BadOutOfRange</c> by the node manager before any backend sees it — a far-future row is never a legitimate
+    ///     history edit, and on a backend that judges retention against the newest timestamp it could age out every
+    ///     older partition. Applies to every backend. The live recorder is not bounded. Non-positive disables the bound.
+    ///     Default 1 day.
+    /// </summary>
+    public TimeSpan HistoryUpdateMaxFutureSkew { get; init; } = TimeSpan.FromDays(1);
+
     /// <summary>Returns operator-facing misconfiguration warnings for an <c>Enabled</c> historian
     /// (empty when disabled or correctly configured). Pure — the registration logs each entry.
     /// <para>