fix(sql): a skipped tag reports the deploy gate's reason, pinned for the deferred Query model (R06:S-4)

A model:Query tag reached the runtime skip ledger as a generic 'did not map'. The
ledger reason (and the skip warning) now comes from SqlTagDefinitionFactory.Inspect -
the deploy gate's own explanation over the same parser - so /hosts names the
deferral. A test pins that the deploy gate names Query through the parser. Making it
a hard deploy error in Warn mode is a ControlPlane change (follow-up); MySql/Odbc and
allowWrites remain feature issues.

Refs #744
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Sql/SqlDriver.cs

@@ -929,10 +929,15 @@ public sealed class SqlDriver
                     table[entry.RawPath] = definition;
                 else
                 {
-                    blobSkips.Add(new SkippedTag(entry.RawPath, "TagConfig did not map to a definition"));
+                    // The reason is the DEPLOY GATE's own explanation (R06:S-4) — SqlTagDefinitionFactory.Inspect
+                    // asks this same parser and then says why — so /hosts names e.g. the deferred Query model
+                    // instead of a generic "did not map" for a tag the gate already warned about.
+                    var reason = SqlTagDefinitionFactory.Inspect(entry.TagConfig).FirstOrDefault()
+                                 ?? "TagConfig did not map to a definition";
+                    blobSkips.Add(new SkippedTag(entry.RawPath, reason));
                     _logger.LogWarning(
-                        "Sql tag config did not map to a definition; skipping. Driver={DriverInstanceId} RawPath={RawPath}",
-                        _driverInstanceId, entry.RawPath);
+                        "Sql tag config did not map to a definition; skipping. Driver={DriverInstanceId} RawPath={RawPath} Reason={Reason}",
+                        _driverInstanceId, entry.RawPath, reason);
                 }
             }
             catch (Exception ex)

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Sql.Tests/SqlDriverTests.cs

@@ -464,6 +464,26 @@ public sealed class SqlDriverTests
         }
     }
 
+    /// <summary>
+    ///     <b>R06:S-4.</b> A skipped tag's ledger reason (what /hosts shows) is the deploy gate's own explanation
+    ///     — for a <c>Query</c> tag, that the model is deferred — instead of a generic "did not map". Control: a
+    ///     well-formed tag is not skipped at all.
+    /// </summary>
+    [Fact]
+    public async Task ADeferredQueryTag_isSkipped_withTheGatesReason()
+    {
+        using var fixture = new SqlitePollFixture();
+        await using var driver = NewDriver(fixture,
+            KvEntry("Speed", SqlitePollFixture.PresentKey),
+            new RawTagEntry("Q", """{"driver":"Sql","model":"Query","table":"T","query":"SELECT 1"}""", WriteIdempotent: false));
+        await driver.InitializeAsync(ConfigJson, CancellationToken.None);
+
+        var report = ((ISkippedTagReporter)driver).GetSkippedTags().ShouldNotBeNull();
+        var skipped = report.Sample.ShouldHaveSingleItem();
+        skipped.RawPath.ShouldBe("Q");
+        skipped.Reason.ShouldContain("Query");
+    }
+
     // ---- Driver.Sql-010: the health field is read-modify-written from several poll loops ----
 
     [Fact]

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Sql.Tests/SqlEquipmentTagParserTests.cs

@@ -232,6 +232,21 @@ public class SqlEquipmentTagParserTests
         SqlEquipmentTagParser.TryParse(json, "raw", out _).ShouldBeFalse();
     }
 
+    /// <summary>
+    ///     <b>R06:S-4.</b> The deploy gate (<c>EquipmentTagConfigInspector</c>) reaches this through the parser:
+    ///     a <c>Query</c> tag draws a warning naming the deferral (a rejection under TagConfigValidation=Error).
+    ///     Control: a served key-value blob draws nothing.
+    /// </summary>
+    [Fact]
+    public void Inspect_theDeferredQueryModel_isNamedAtTheDeployGate()
+    {
+        SqlTagDefinitionFactory.Inspect("""{"driver":"Sql","model":"Query","table":"T","query":"SELECT 1"}""")
+            .ShouldHaveSingleItem().ShouldContain("Query");
+        SqlTagDefinitionFactory.Inspect(
+                """{"driver":"Sql","model":"KeyValue","table":"T","keyColumn":"k","keyValue":"v","valueColumn":"c"}""")
+            .ShouldBeEmpty();
+    }
+
     [Theory]
     [InlineData("""{"driver":"Sql","model":"KeyValue","keyColumn":"k","keyValue":"v","valueColumn":"c"}""")]
     [InlineData("""{"driver":"Sql","model":"KeyValue","table":"","keyColumn":"k","keyValue":"v","valueColumn":"c"}""")]