Add Assembly.TryGetVersionString() extension

[Copilot]

Adds a TryGetVersionString() extension on Assembly that returns the informational version string, falling back to the assembly version if AssemblyInformationalVersionAttribute is absent, and null if neither is set.

Changes

• PowerKit/Extensions/AssemblyExtensions.cs: New extension returning AssemblyInformationalVersionAttribute.InformationalVersion ?? assembly.GetName().Version?.ToString()
• PowerKit.Tests/AssemblyExtensionsTests.cs: Test covering the happy path against the test assembly

Usage

var version = Assembly.GetExecutingAssembly().TryGetVersionString();
// "1.2.3+abc123" (informational), "1.2.3.0" (fallback), or null

[Copilot]

Pull request overview

Adds a new Assembly extension to retrieve an assembly version string in a consumer-friendly way (prefer informational version; fall back to assembly version; otherwise null), along with a unit test in the test suite that compiles PowerKit as source.

Changes:

• Added Assembly.TryGetVersionString() extension that reads AssemblyInformationalVersionAttribute and falls back to AssemblyName.Version.
• Added an xUnit test for the new extension.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
PowerKit/Extensions/AssemblyExtensions.cs	Introduces TryGetVersionString() that prioritizes informational version and falls back to assembly version.
PowerKit.Tests/AssemblyExtensionsTests.cs	Adds a test for the new extension method.

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