Port remaining upstream bug fixes for two rules

UseDeclaredVarsMoreThanAssignments (PowerShell#2013): skip scope-qualified
variable references ($global:, $script:, drive-qualified) when
checking for uses of local variables, preventing false negatives.

AvoidPositionalParameters (PowerShell#1850): skip commands that have no
parameters in the database (e.g. native CLI tools like az).

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: rjmholt

PSpecter/Builtin/Rules/AvoidPositionalParameters.cs

@@ -82,6 +82,11 @@ public override IEnumerable<ScriptDiagnostic> AnalyzeScript(Ast ast, IReadOnlyLi
                     continue;
                 }
 
+                if (HasNoParameters(commandName))
+                {
+                    continue;
+                }
+
                 if (HasSplattedVariable(cmdAst))
                 {
                     continue;
@@ -114,6 +119,12 @@ private bool IsApplicationCommand(string commandName)
                 && string.Equals(metadata!.CommandType, "Application", StringComparison.OrdinalIgnoreCase);
         }
 
+        private bool HasNoParameters(string commandName)
+        {
+            return _commandDb.TryGetCommand(commandName, platforms: null, out CommandMetadata? metadata)
+                && metadata!.Parameters.Count == 0;
+        }
+
         private static bool LooksLikeCmdlet(string commandName)
         {
             int hyphen = commandName.IndexOf('-');

PSpecter/Builtin/Rules/UseDeclaredVarsMoreThanAssignments.cs

@@ -110,6 +110,13 @@ private IEnumerable<ScriptDiagnostic> AnalyzeScriptBlockAst(ScriptBlockAst scrip
             {
                 foreach (VariableExpressionAst varAst in varAsts)
                 {
+                    if (varAst.VariablePath.IsGlobal
+                        || varAst.VariablePath.IsScript
+                        || varAst.VariablePath.DriveName != null)
+                    {
+                        continue;
+                    }
+
                     varKey = varAst.GetNameWithoutScope();
                     inAssignment = false;