v15 preparations

[feO2x]

• updated README.md for v15
• updated <PackageReleaseNotes>
• Roslyn Analyzer and Code Fix projects are no longer signed in CI

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Light.GuardClauses	98%	91%	2388	✔
Light.GuardClauses.InternalRoslynAnalyzers	96%	86%	52	✔
Light.GuardClauses.InternalRoslynAnalyzers.CodeFixes	95%	100%	8	✔
Light.GuardClauses.SourceCodeTransformation	92%	83%	667	✔
Summary	96% (4585 / 4775)	89% (2516 / 2813)	3115	✔

[Copilot]

Pull request overview

Prepares the Light.GuardClauses repository for the v15 release by updating versioning/release notes and documentation, adjusting analyzer/code-fix signing behavior, and improving determinism of the source-export output.

Changes:

• Bumps version/copyright to 15.0.0 / 2026 and updates package release notes for v15.
• Enhances README with updated positioning and target framework guidance.
• Adjusts source exporter formatting and adds a test asserting LF-only line endings; updates build/release plumbing (analyzer signing + NuGet workflow hardening).

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/source-export/Light.GuardClauses.SourceCodeTransformation/SourceFileMerger.cs	Enforces LF normalization in generated source and updates embedded license year.
tools/source-export/Light.GuardClauses.SourceCodeTransformation/CleanupStep.cs	Switches line parsing to LF semantics to align with LF-only export goal.
tests/Light.GuardClauses.SourceCodeTransformation.Tests/SourceFileMergerFrameworkTests.cs	Adds test asserting exported file contains no \r characters.
src/Light.GuardClauses/Light.GuardClauses.csproj	Removes signing-related global properties when building analyzer/code-fix project references.
src/Directory.Build.props	Updates <PackageReleaseNotes> for 15.0.0.
README.md	Updates landing page content, examples, and target framework documentation.
Light.GuardClauses.SingleFile.cs	Updates single-file header version and copyright year.
Directory.Build.props	Bumps package version and copyright year.
.idea/.idea.Light.GuardClauses/.idea/indexLayout.xml	Updates IDE indexing layout (adds .github).
.github/workflows/release-on-nuget.yml	Hardens secret handling/cleanup and quotes variables for safer CI execution.

Files not reviewed (1)

• .idea/.idea.Light.GuardClauses/.idea/indexLayout.xml: Generated file

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