Bump SDK, WinVs, and WinVs.Wpf versions to 2.26129.0.1 and update dependencies accordingly. Introduce IVsCSharpActions for C# model search operations and expose it via IVsActions. Update SdkSupport version constants and refresh release notes to reflect changes and recompile requirements.

- Bump all projects to version 2.26148.0.1-PreRelease and update copyright to 2026
- Add or update README.md for all NuGet packages and include in package metadata
- Update NuGet dependencies to require new SDK version
- Add WildcardSearch utility for fast wildcard matching in CodeFactory.WinVs
- Introduce CSharpModelSearchType enum for flexible model searching
- Refactor IVsCSharpActions: unify model search into FindCSharpModelsInProject, support wildcards and filtering, update interface implementation search return type
- Improve XML docs and clean up generics usage
- Ensure all new/updated files are packaged for NuGet

Add GetSource extension methods for CsContainer and CsMember with XML docs and null checks. Enhance WildcardSearch.Matches to support raw regex patterns (enclosed in slashes), including caching and error handling. Update documentation to reflect new pattern handling.

Updated all package and runtime versions to 2.26149.0.1. Enhanced WildcardSearch.cs with a 2-second regex timeout, improved wildcard logic to exclude path separators, and added safe handling for regex timeouts. Updated documentation and release notes to reflect these changes.

Incremented all package and dependency versions to 2.26150.0.1. Updated minimum runtime requirements and max supported SDK version. Renamed FindCSharpModelsInProject to FindCSharpModelsInProjectAsync. Refreshed release notes and documentation to match new version and recompile requirements.

Advance SDK version to 2.26151.0.1 across all projects, dependencies, and documentation. Refactor C# model classes for performance and memory efficiency: replace `ImmutableList<T>.Empty` and LINQ with `Array.Empty<T>()`, `ImmutableArray<T>.CreateBuilder()`, and explicit loops; use `OfType<T>()` and `HashSet<T>` for safer, faster operations; fix logical operator usage and attribute formatting bug. Remove legacy extension classes. Update `NamespaceManager` for O(1) lookups. Refresh copyright years and README.