Add RegistryHive extension members: Moniker and OpenKey

[Copilot]

Ports RegistryHive extensions from LightBulb into PowerKit, extending the existing RegistryExtensions with a new extension(RegistryHive hive) block.

Changes

• Moniker — property that maps a RegistryHive value to its conventional short name (HKCU, HKLM, HKCR, HKU, HKPD, HKCC); annotated with [SupportedOSPlatform("windows")] since RegistryHive enum values are Windows-only on .NET 5+.
• OpenKey(RegistryView view = RegistryView.Default) — wraps RegistryKey.OpenBaseKey; guarded with #if NET40_OR_GREATER || NET5_0_OR_GREATER since RegistryView and the corresponding OpenBaseKey overload are unavailable on .NET 3.5.

RegistryKey key = RegistryHive.CurrentUser.OpenKey(RegistryView.Registry64);
string moniker = RegistryHive.LocalMachine.Moniker; // "HKLM"

[Copilot]

Pull request overview

Ports RegistryHive extension helpers into PowerKit by extending RegistryExtensions with a new extension(RegistryHive hive) block, complementing the existing RegistryKey extensions.

Changes:

• Added RegistryHive.GetShortMoniker() to map common hives to short names (e.g., HKCU, HKLM).
• Added RegistryHive.OpenKey(RegistryView view = RegistryView.Default) (guarded for NET40_OR_GREATER || NET5_0_OR_GREATER) as a wrapper over RegistryKey.OpenBaseKey.

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[Tyrrrz]

@copilot please fix build errors

[Tyrrrz]

@copilot fix build errors

[Copilot]

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[codecov]

Codecov Report

❌ Patch coverage is 37.50000% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.98%. Comparing base (ca0f66e) to head (c560923).
⚠️ Report is 4 commits behind head on prime.

Files with missing lines	Patch %	Lines
PowerKit/Extensions/RegistryExtensions.cs	9.09%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #66      +/-   ##
==========================================
- Coverage   94.89%   93.98%   -0.92%     
==========================================
  Files         120      124       +4     
  Lines        2332     2459     +127     
  Branches      177      197      +20     
==========================================
+ Hits         2213     2311      +98     
- Misses         85      107      +22     
- Partials       34       41       +7     

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