feat(scripts): add CIHelpers.psm1 shared CI module (#129)

* feat(scripts): add CIHelpers.psm1 shared CI platform abstraction module

- add 11 exported functions for CI platform detection and output
- support GitHub Actions, Azure DevOps, and local execution modes
- include encoding utilities for GHA and ADO logging commands
- pass PSScriptAnalyzer validation with project settings

🔧 - Generated by Copilot

* fix(scripts): resolve PR review findings for CIHelpers module

- remove UTF-8 BOM from CIHelpers.psm1
- sanitize ADO logging commands in Write-CIStepSummary
- wrap pipeline results in @() to prevent .Count crash under StrictMode
- fix workflow splatting to use array args for switch parameters
- reformat markdown tables in workflows/README.md

🔧 - Generated by Copilot

Author: WilliamBerryiii

.github/workflows/ps-script-analyzer.yml

@@ -43,16 +43,14 @@ jobs:
       - name: Run PSScriptAnalyzer
         shell: pwsh
         run: |
-          $params = @{}
-
+          $args = @()
           if ('${{ inputs.changed-files-only }}' -eq 'true') {
-            $params['ChangedFilesOnly'] = $true
+            $args += '-ChangedFilesOnly'
           }
           if ('${{ inputs.soft-fail }}' -eq 'true') {
-            $params['SoftFail'] = $true
+            $args += '-SoftFail'
           }
-
-          & scripts/linting/Invoke-PSScriptAnalyzer.ps1 @params
+          & scripts/linting/Invoke-PSScriptAnalyzer.ps1 @args
 
       - name: Upload PSScriptAnalyzer results
         if: always()