Verify SQL Server lifecycle dates and add SQL Server 2025

All mainstream and extended support end dates checked against Microsoft
sources. SQL Server 2025 added (mainstream ends 2031-01-06, extended
2036-01-06), so the lifecycle rule now evaluates 2025 instead of reporting
it as not measurable.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E3EExwndy8Z22EK2Qpt6BK

src/SQLInsight.Rules/Lifecycle/support-lifecycle.json

@@ -1,6 +1,6 @@
 {
   "source": "https://learn.microsoft.com/lifecycle/products/?terms=SQL%20Server",
-  "comment": "End of mainstream and extended support per release. null means not yet published in the catalog.",
+  "comment": "End of mainstream and extended support per release (Fixed Lifecycle Policy, RTM/latest service pack). Verified 2026-09-29 against Microsoft Lifecycle and Microsoft SQL Server blog announcements. null means not yet published. Extended Security Updates (paid) are deliberately not included: an instance on ESU is still out of standard support.",
   "releases": [
     { "release": "SqlServer2000",   "mainstreamEnd": "2008-04-08", "extendedEnd": "2013-04-09" },
     { "release": "SqlServer2005",   "mainstreamEnd": "2011-04-12", "extendedEnd": "2016-04-12" },
@@ -12,6 +12,6 @@
     { "release": "SqlServer2017",   "mainstreamEnd": "2022-10-11", "extendedEnd": "2027-10-12" },
     { "release": "SqlServer2019",   "mainstreamEnd": "2025-02-28", "extendedEnd": "2030-01-08" },
     { "release": "SqlServer2022",   "mainstreamEnd": "2028-01-11", "extendedEnd": "2033-01-11" },
-    { "release": "SqlServer2025",   "mainstreamEnd": null,         "extendedEnd": null }
+    { "release": "SqlServer2025",   "mainstreamEnd": "2031-01-06", "extendedEnd": "2036-01-06" }
   ]
 }

tests/SQLInsight.Rules.Tests/SupportLifecycleRuleTests.cs

@@ -58,10 +58,20 @@ public class SupportLifecycleRuleTests
     }
 
     [Fact]
-    public void Release_without_published_dates_is_not_measurable()
+    public void Sql2025_is_in_mainstream_support()
     {
         var evaluation = Rule.Evaluate(TestInstances.Context("17.0.1000.7", Today));
 
+        Assert.Equal(RuleOutcome.Passed, evaluation.Outcome);
+    }
+
+    [Fact]
+    public void Release_without_published_dates_is_not_measurable()
+    {
+        var catalog = new SupportLifecycleCatalog([new SupportLifecycle(SqlServerRelease.SqlServer2025, null, null)]);
+
+        var evaluation = new SupportLifecycleRule(catalog).Evaluate(TestInstances.Context("17.0.1000.7", Today));
+
         Assert.Equal(RuleOutcome.NotMeasurable, evaluation.Outcome);
     }
 
@@ -81,13 +91,17 @@ public class SupportLifecycleRuleTests
     }
 
     [Fact]
-    public void Catalog_covers_every_known_release()
+    public void Catalog_has_dates_for_every_known_release()
     {
         var catalog = SupportLifecycleCatalog.LoadEmbedded();
 
         foreach (var release in Enum.GetValues<SqlServerRelease>().Where(r => r != SqlServerRelease.Unknown))
         {
-            Assert.NotNull(catalog.Find(release));
+            var lifecycle = catalog.Find(release);
+            Assert.NotNull(lifecycle);
+            Assert.NotNull(lifecycle.MainstreamEnd);
+            Assert.NotNull(lifecycle.ExtendedEnd);
+            Assert.True(lifecycle.ExtendedEnd > lifecycle.MainstreamEnd, $"{release}: extended must end after mainstream");
         }
     }
 }