feat(#212): update Pester code coverage configuration for private scripts

- Refine path patterns to include nested private scripts
- Add tests for project.json Pester coverage configuration

Author: stiwicourage

project.json

@@ -44,7 +44,9 @@
       "Enabled": true,
       "Path": [
         "src/public/*.ps1",
-        "src/private/**/*.ps1"
+        "src/private/*.ps1",
+        "src/private/*/*.ps1",
+        "src/private/*/*/*.ps1"
       ],
       "CoveragePercentTarget": 99,
       "OutputPath": "artifacts/coverage.xml",

tests/ProjectPesterCoverageConfiguration.Tests.ps1

@@ -0,0 +1,15 @@
+BeforeAll {
+    $projectRoot = Split-Path -Parent $PSScriptRoot
+    $script:projectJson = Get-Content -LiteralPath (Join-Path $projectRoot 'project.json') -Raw | ConvertFrom-Json -AsHashtable
+}
+
+Describe 'project.json Pester code coverage configuration' {
+    It 'uses explicit private-source globs so nested helpers stay measurable' {
+        $script:projectJson.Pester.CodeCoverage.Path | Should -Be @(
+            'src/public/*.ps1'
+            'src/private/*.ps1'
+            'src/private/*/*.ps1'
+            'src/private/*/*/*.ps1'
+        )
+    }
+}