🔨Fix build scripts to handle missing Visual Studio

[angularsen]

• Fix init.ps1 to check if Visual Studio exists before using vswhere
• Add proper null checks for MSBuild path
• Make NanoFramework build optional when MSBuild is not available
• Show clear warning messages when Visual Studio is not installed

This allows the main build to work without Visual Studio installed, while still supporting NanoFramework builds when VS is available.

[claude]

Code Review

✅ Overall Assessment

This is a well-crafted infrastructure improvement that makes the build system more resilient without introducing any breaking changes.

👍 Positive Changes

• Defensive Programming: Excellent null checks and existence validation for Visual Studio dependencies
• Graceful Degradation: Build continues for main targets even without VS, while NanoFramework builds are skipped with clear warnings
• Clear Messaging: Informative messages help developers understand what's happening when VS is missing
• No Breaking Changes: Existing workflows remain intact when Visual Studio is present

📋 Technical Review

Build Scripts (build-functions.psm1, init.ps1):

• Proper null initialization patterns used throughout
• Error suppression (2>$null) appropriately applied to prevent noisy output
• Conditional logic is clear and follows PowerShell best practices
• MSBuild path detection now safely handles missing Visual Studio installations

✔️ No Concerns Identified

• Breaking Changes: None - functionality preserved for existing setups
• Style/Conventions: PowerShell code follows project patterns
• Code Quality: Defensive improvements enhance robustness
• Performance: No impact - only adds lightweight existence checks
• Test Coverage: Not applicable (infrastructure-only change)
• Security: No security implications

🎯 Recommendation

APPROVED - This is a straightforward improvement that makes the build system more user-friendly for contributors who may not have Visual Studio installed. The changes are minimal, well-targeted, and maintain backward compatibility.

The PR successfully addresses the issue while preserving full functionality for environments with Visual Studio installed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96%. Comparing base (dd045a8) to head (3289cea).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1626   +/-   ##
======================================
  Coverage      96%     96%           
======================================
  Files         322     322           
  Lines       27531   27531           
======================================
  Hits        26488   26488           
  Misses       1043    1043           

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