fix(tests): correct $parameterNames variable and preserve original exception

- tests/Help.tests.ps1: rename undefined $parameterNames to $commandParameterNames
  in the help-vs-code parameter existence check. The variable was never assigned
  in scope, silently making the assertion always evaluate against $null.
- {{ModuleName}}/{{ModuleName}}.psm1: re-throw original exception object in the
  dot-source catch block instead of throwing a new string, preserving stack
  traces and inner-exception details for debugging.

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

Author: tablackburn

tests/Help.tests.ps1

@@ -213,7 +213,7 @@ Describe "Test help for <_.Name>" -ForEach $commands {
 
         # Shouldn't find extra parameters in help
         It 'finds help parameter in code: <_>' {
-            $_ -in $parameterNames | Should -Be $true
+            $_ -in $commandParameterNames | Should -Be $true
         }
     }
 }

{{ModuleName}}/{{ModuleName}}.psm1

@@ -5,7 +5,8 @@ foreach ($import in @($public + $private)) {
     try {
         . $import.FullName
     } catch {
-        throw "Unable to dot source [$($import.FullName)]"
+        Write-Error "Unable to dot source '$($import.FullName)'"
+        throw $_
     }
 }