feat: Enable null reference types

.editorconfig

@@ -503,4 +503,55 @@ dotnet_naming_symbols.private_internal_fields.applicable_kinds = field
 dotnet_naming_symbols.private_internal_fields.applicable_accessibilities = private, internal
 
 dotnet_naming_style.camel_case_underscore_style.required_prefix = _
-dotnet_naming_style.camel_case_underscore_style.capitalization = camel_case
+dotnet_naming_style.camel_case_underscore_style.capitalization = camel_case
+
+# Meziantou.Analyzer rules
+# https://github.com/meziantou/Meziantou.Analyzer/tree/main/docs/Rules
+
+# MA0002: Use IEqualityComparer/IComparer - HashSet/Dictionary use ordinal by default which is correct for most cases
+dotnet_diagnostic.MA0002.severity = suggestion
+
+# MA0004: Use Task.ConfigureAwait
+dotnet_diagnostic.MA0004.severity = suggestion
+
+# MA0006: Use string.Equals instead of == for string comparison
+dotnet_diagnostic.MA0006.severity = suggestion
+
+# MA0011: IFormatProvider is missing
+dotnet_diagnostic.MA0011.severity = suggestion
+
+# MA0015: Specify the parameter name in ArgumentException - lowered since validation methods validate properties not parameters
+dotnet_diagnostic.MA0015.severity = suggestion
+
+# MA0016: Prefer using collection abstraction instead of implementation
+dotnet_diagnostic.MA0016.severity = suggestion
+
+# MA0018: Do not declare static members on generic types
+dotnet_diagnostic.MA0018.severity = suggestion
+
+# MA0026: Fix TODO comment
+dotnet_diagnostic.MA0026.severity = suggestion
+
+# MA0039: Do not write your own certificate validation method - intentional for simulator to accept self-signed certs
+dotnet_diagnostic.MA0039.severity = none
+
+# MA0048: File name must match type name - noisy for internal helper types in same file
+dotnet_diagnostic.MA0048.severity = suggestion
+
+# MA0049: Type name should not match containing namespace
+dotnet_diagnostic.MA0049.severity = suggestion
+
+# MA0051: Method is too long
+dotnet_diagnostic.MA0051.severity = suggestion
+
+# MA0055: Do not use finalizer - allowed in test fixtures for cleanup safety nets
+dotnet_diagnostic.MA0055.severity = suggestion
+
+# MA0158: Use System.Threading.Lock (.NET 9+) - lowered due to multi-targeting .NET 8 which doesn't have Lock
+dotnet_diagnostic.MA0158.severity = suggestion
+
+# MA0074: Use overload with StringComparison parameter
+dotnet_diagnostic.MA0074.severity = warning
+
+# MA0099: Use the null-forgiving operator with caution (disallow !)
+dotnet_diagnostic.MA0099.severity = warning