#### AI description  (iteration 1)
#### PR Classification
This pull request imports an extensive suite of code—from native interop libraries and build scripts to CI configurations and documentation—from GitHub to fully integrate PowerShell’s core components.

#### PR Summary
The PR brings in hundreds of new files that set up native interop support, multi‑platform builds, and automation for testing and packaging. Key changes include:
- **`src/PowerShell.Core.Instrumentation/`**: Added the ETW manifest file and the PowerShell ETW registration script to support event tracing.
- **`src/libpsl-native/`**: Introduced a comprehensive native library in C/C++ with new source and header files (for file stat, ownership, process creation, symlink handling, etc.), along with CMakeLists and toolchain files for building on Windows, Linux, and macOS.
- **Build and CI Scripts**: Added/upgraded `/build.psm1`, various CMakeLists files, and YAML pipeline configurations (CodeQL, Azure Pipelines for Windows, Linux, and macOS) for automated builds and tests.
- **Documentation and Guidelines**: Added a new CONTRIBUTING.md, updated README.md, SECURITY.md, and Code of Conduct to guide contributors and ensure compliance.
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