chore(sonar): second sweep — catch .Length, Is.Not.Empty, and newly-exposed Multiple groups (NUnit2046, NUnit2045)

Re-runs `dotnet format analyzers --diagnostics NUnit2046 NUnit2045` after
the Tier 2 Assert.Multiple wrap, which exposed:

- `Has.Length.EqualTo(n)` rewrites for `string[]`/array `.Length` checks
  (the first pass only knew about `.Count`).
- `Is.Not.Empty` rewrites for `Count, Is.GreaterThan(0)`.
- A handful of new NUnit2045 groups that became wrappable once the
  initial Multiple blocks settled the surrounding indentation.

Tests still 1180/1180 passing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Strata.SqlTools.Snowflake.Tests/Snowflake/QueryBreakdownCollectionTests.cs

@@ -247,7 +247,7 @@ public class QueryBreakdownCollectionTests
         var report = _collection.GetParameterUsageReport().ToList();
 
         // Assert
-        Assert.That(report.Count, Is.GreaterThan(0));
+        Assert.That(report, Is.Not.Empty);
         var userIdReport = report.FirstOrDefault(r => r.ParameterName == "UserId");
         Assert.That(userIdReport, Is.Not.Null);
         Assert.That(userIdReport?.UsedInQueryCount, Is.EqualTo(2));

tests/Strata.SqlTools.Snowflake.Tests/Snowflake/QueryBreakdownTests.cs

@@ -127,7 +127,7 @@ public class QueryBreakdownTests
         // Verify 4-space Snowflake indentation
         var lines = sql.Split(separator, StringSplitOptions.RemoveEmptyEntries);
         var indentedLines = lines.Where(l => l.StartsWith("    ")).ToList();
-        Assert.That(indentedLines.Count, Is.GreaterThan(0));
+        Assert.That(indentedLines, Is.Not.Empty);
     }
 
     [Test]
@@ -306,10 +306,13 @@ public class QueryBreakdownTests
             Assert.That(withIndex, Is.GreaterThan(-1));
             Assert.That(mainSelectIndex, Is.GreaterThan(-1));
         });
-        Assert.That(withIndex, Is.LessThan(mainSelectIndex));
+        Assert.Multiple(() =>
+        {
+            Assert.That(withIndex, Is.LessThan(mainSelectIndex));
 
-        // Assert - Verify CTE definition
-        Assert.That(sql, Does.Contain("PRODUCT_TOTALS"));
+            // Assert - Verify CTE definition
+            Assert.That(sql, Does.Contain("PRODUCT_TOTALS"));
+        });
         Assert.That(sql, Does.Contain("AS"));
         Assert.That(sql, Does.Contain("PRODUCT_ID"));
         Assert.That(sql, Does.Contain("TOTAL_QUANTITY"));
@@ -457,7 +460,7 @@ public class QueryBreakdownTests
         // Assert
         // Main query value should win
         var keys = merged.Keys.Where(k => k.Contains("QueryLimit")).ToList();
-        Assert.That(keys.Count, Is.GreaterThan(0));
+        Assert.That(keys, Is.Not.Empty);
         // All QueryLimit entries should be 100 (main query's value)
         foreach (var key in keys)
         {
@@ -614,7 +617,7 @@ public class QueryBreakdownTests
         var queryBreakdown = QueryBreakdown.Parse(sql, false);
 
         // Assert
-        Assert.That(queryBreakdown.Parameters.Count, Is.GreaterThan(0));
+        Assert.That(queryBreakdown.Parameters, Is.Not.Empty);
     }
 
     [Test]
@@ -1070,7 +1073,7 @@ public class QueryBreakdownTests
 
         // Assert
         // Base class normalizes to @, but Snowflake might handle differently
-        Assert.That(queryBreakdown.Parameters.Count, Is.GreaterThan(0));
+        Assert.That(queryBreakdown.Parameters, Is.Not.Empty);
     }
 
     #endregion
@@ -1188,7 +1191,7 @@ public class QueryBreakdownTests
         // Assert - Snowflake should use 4-space indent, base uses 5-space
         var snowflakeLines = snowflakeSql.Split(separator, StringSplitOptions.RemoveEmptyEntries);
         var snowflakeIndentedLines = snowflakeLines.Where(l => l.StartsWith("    ") && !l.StartsWith("     ")).ToList();
-        Assert.That(snowflakeIndentedLines.Count, Is.GreaterThan(0), "Snowflake should use 4-space indentation");
+        Assert.That(snowflakeIndentedLines, Is.Not.Empty, "Snowflake should use 4-space indentation");
     }
 
     #endregion
@@ -1407,7 +1410,7 @@ public class QueryBreakdownTests
         // Verify Snowflake-style formatting (4-space indentation)
         var lines = snowflakeSql.Split(separator, StringSplitOptions.RemoveEmptyEntries);
         var indentedLines = lines.Where(l => l.StartsWith("    ")).ToList();
-        Assert.That(indentedLines.Count, Is.GreaterThan(0), "Should have Snowflake-style indentation");
+        Assert.That(indentedLines, Is.Not.Empty, "Should have Snowflake-style indentation");
     }
 
     [Test]