fix(historian): refuse aggregates not valid for the node's DataType up front (#897)

TimeAverage / Total on a Boolean node over the Gateway backend (AVEVA discrete tag, live
SysPulse) went to the gateway since native TimeAverage/Total became default-on (#694). AVEVA
refuses both modes at StartQuery; the gateway reports that only as Internal /
HistorianServerOperationException (the same answer as a historian storage fault), so the
node answered BadHistoryOperationUnsupported and the read counted as a backend failure.

HistoryRead-Processed now checks the node's scalar DataType before calling any backend and
answers BadAggregateNotSupported (Part 11 6.5.4: "If the Aggregate is not valid for the Node
then the StatusCode shall be Bad_AggregateNotSupported"). Nothing is sent, nothing is counted.
- Shared, every backend: HistoryAggregateDataTypes (Core.Abstractions) applies Part 13
  5.4.2.3 Table 50: the numeric-only aggregates (Average, TimeAverage(2), Total(2), Min/Max,
  ActualTime, Range, Delta, DeltaBounds, Interpolative, stddev/variance) on a String or
  DateTime node are refused. Client-visible: the SQL backends used to answer every interval
  BadAggregateInvalidInputs.
- Per backend: IHistorianDataSource.SupportsAggregateFor(aggregate, TypeCode?) (default true;
  every production backend declares it, guard-tested). Gateway: false for native
  TimeAverage/Total on a Boolean node. SqlServer/QuestDb: true, since they serve Boolean as
  0/1 (stepped), so Boolean stays served there, as do the Gateway's raw-evaluated aggregates.

The residual case (a node declared numeric whose AVEVA tag is discrete) cannot be told apart
from a historian fault on the wire and still counts; that needs the gateway to surface
AVEVA's native error code as a deterministic status.

Tests: HistoryAggregateDataTypesTests, guard test, node-manager String/DateTime and per-type
refusals, Gateway capability matrix, DiscreteTagTimeWeightedWireTests (production Gateway
backend over an AVEVA-shaped fake: unsent, 0 health failures, positive controls). Each
mutation (no check, no shared rule, no backend hint, Gateway hint true, shared rule always
true, SQL inheriting the default) fails at least one. Live gate re-run read-only against
AVEVA 2023 R2 via a private HistorianGateway fa9cf31 container: SysPulse TimeAverage on the
wire = BadAggregateNotSupported, health failures unchanged; #801 gate 244 cases pass.

Claude-Session: https://claude.ai/code/session_01GT67ACmpMR7b9LGRPLijMi

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.Gateway/GatewayHistorianDataSource.cs

@@ -722,6 +722,15 @@ public sealed class GatewayHistorianDataSource : IHistorianDataSource, IAsyncDis
     public IReadOnlySet<HistoryAggregateType> SupportedAggregates =>
         _enableNativeTimeWeighted ? ServedAggregates : RawEvaluatedAggregates;
 
+    /// <inheritdoc />
+    // false for AVEVA's native TimeAverage / Total on a Boolean node (lmxopcua#897): AVEVA refuses both retrieval modes on a
+    // discrete tag at StartQuery, and the gateway answers that only as Internal / HistorianServerOperationException — the
+    // same answer as a historian storage fault — so it read as BadHistoryOperationUnsupported and a backend failure. The
+    // server now answers BadAggregateNotSupported up front and nothing is sent. The raw-evaluated aggregates serve a
+    // Boolean as 0/1 (as the SQL backends do); a String / DateTime node is refused by the shared HistoryAggregateDataTypes rule.
+    public bool SupportsAggregateFor(HistoryAggregateType aggregate, TypeCode? valueType) =>
+        !(valueType == TypeCode.Boolean && AggregateModeMapper.NativeAggregates.Contains(aggregate));
+
     /// <inheritdoc />
     // Data + events, but NOT ServerTimestamps: AVEVA keeps no per-sample server time, so SampleMapper stamps the read
     // time — advertising ServerTimestampSupported would promise a stored value we do not have (lmxopcua#881).

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.QuestDb/QuestDbHistorianDataSource.cs

@@ -438,6 +438,11 @@ public sealed class QuestDbHistorianDataSource : IHistorianDataSource
     /// <inheritdoc />
     public IReadOnlySet<HistoryAggregateType> SupportedAggregates => AggregateFamilies.Served;
 
+    /// <inheritdoc />
+    // true for every type: a Boolean node's numeric aggregates are served as 0/1 (stepped for the time-weighted ones), and a
+    // String / DateTime node's numeric ones are refused by the server's shared HistoryAggregateDataTypes rule before this.
+    public bool SupportsAggregateFor(HistoryAggregateType aggregate, TypeCode? valueType) => true;
+
     /// <inheritdoc />
     // Data + events; every sample row stores its server time and a raw read returns it (lmxopcua#881).
     public HistorianReadCapabilities ReadCapabilities =>

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.SqlServer/SqlServerHistorianDataSource.cs

@@ -363,6 +363,11 @@ public sealed class SqlServerHistorianDataSource : IHistorianDataSource
     /// <inheritdoc />
     public IReadOnlySet<HistoryAggregateType> SupportedAggregates => AggregateFamilies.Served;
 
+    /// <inheritdoc />
+    // true for every type: a Boolean node's numeric aggregates are served as 0/1 (stepped for the time-weighted ones), and a
+    // String / DateTime node's numeric ones are refused by the server's shared HistoryAggregateDataTypes rule before this.
+    public bool SupportsAggregateFor(HistoryAggregateType aggregate, TypeCode? valueType) => true;
+
     /// <inheritdoc />
     // Data + events; every sample row stores ServerTimeUtc (written by the recorder / HistoryUpdate) and a raw read
     // returns it (lmxopcua#881).