Add comprehensive documentation for all PowerShell cmdlets

[Copilot]

This PR adds complete PowerShell comment-based help documentation for all 5 exported cmdlets in the FeatureFlags module. Previously, the cmdlets had basic documentation with SYNOPSIS, PARAMETER, and OUTPUTS sections, but were missing critical DESCRIPTION and EXAMPLE sections.

Changes Made

Documentation Added for All Cmdlets:

• Get-FeatureFlagConfigFromFile - Added detailed description and 2 practical examples
• Confirm-FeatureFlagConfig - Added description explaining validation logic and 2 examples
• Test-FeatureFlag - Added description explaining predicate evaluation and 3 examples
• Get-EvaluatedFeatureFlags - Added description and 3 practical usage examples
• Out-EvaluatedFeaturesFiles - Added description of file output formats and 3 examples with notes

New Documentation Features:

• .DESCRIPTION sections explaining what each cmdlet does and how it works
• .EXAMPLE sections with practical, real-world usage scenarios (2-3 examples per cmdlet)
• Enhanced .NOTES sections where appropriate
• All examples demonstrate common use cases and follow PowerShell best practices

Example Before/After

Before:

PS> Get-Help Test-FeatureFlag
# Only showed basic synopsis and parameter info, no description or examples

After:

PS> Get-Help Test-FeatureFlag -Examples
# Now shows comprehensive help with 3 practical examples:
# 1. Basic feature testing
# 2. Testing multiple predicates  
# 3. Conditional environment variable setting

Validation

• All cmdlets load successfully without errors
• Documentation renders correctly with Get-Help -Full, -Detailed, and -Examples
• All required help sections are present and complete
• PowerShell Script Analyzer shows no new issues
• Test script validates all cmdlets have complete documentation

Fixes #7.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• www.powershellgallery.com
  • Triggering command: pwsh tools/run-tests.ps1 (dns block)
  • Triggering command: pwsh -c Install-Module Pester -Force -Scope CurrentUser -RequiredVersion 4.10.1 -SkipPublisherCheck (dns block)
  • Triggering command: pwsh -c Get-PSRepository (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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