chore: Spice86 v15.0.0 major NuGet release + auto prerelease NuGet on master

[Copilot]

Description of Changes

• src/Directory.Build.props – Normalize version to full semver 15.0.0, add explicit AssemblyVersion/FileVersion (15.0.0.0), update PackageReleaseNotes link to v15 wiki page.
• .github/workflows/prerelease.yml – Replace hardcoded base version 11.0.0 with a dynamic read from Directory.Build.props; prerelease packages now version as {Version}-{sha} and auto-track future bumps.
• Tag v15.0.0 – Annotated tag created on this branch; push to origin after merge: git push origin v15.0.0.

Rationale behind Changes

<Version> was set as bare 15 with no AssemblyVersion/FileVersion, and the release notes link still pointed at v14. The prerelease workflow hardcoded 11.0.0 as its base, producing stale NuGet identifiers unrelated to the actual project version.

Suggested Testing Steps

After merge:

1. git push origin v15.0.0
2. Verify the prerelease workflow publishes packages versioned 15.0.0-<sha> to GitHub Packages.
3. Create the Spice86-v15-release-notes wiki page.

[Copilot]

Pull request overview

This PR prepares the Spice86 codebase for the v15.0.0 NuGet release and makes the prerelease packaging workflow track the project’s declared version automatically.

Changes:

• Normalizes the package <Version> to full SemVer (15.0.0) and sets explicit AssemblyVersion/FileVersion to 15.0.0.0.
• Updates NuGet release notes URL to the v15 wiki page.
• Updates the prerelease workflow to derive its base version from src/Directory.Build.props instead of a hardcoded value.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/Directory.Build.props	Sets v15 SemVer + explicit assembly/file versions and updates release notes link.
.github/workflows/prerelease.yml	Derives prerelease version from Directory.Build.props and appends short commit SHA.

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[maximilien-noal]

#2267 (review)

@copilot implement changes based on this feedback

[Copilot]

#2267 (review)

@copilot implement changes based on this feedback

Done in commit chore: bump checkout/setup-dotnet to v4, replace grep -P with awk:

• actions/checkout@v1 → @v4
• actions/setup-dotnet@v1 → @v4
• grep -oPm1 "(?<=<Version>)..." replaced with awk -F'[<>]' '/<Version>/{print $3; exit}' (no PCRE dependency)

[maximilien-noal]

@copilot for a new nuget regular release to be made, you must bump to v16 !

and the master branch is protected. I want a new NUGET prerelease too on each PR merge.

The github prerelease is nice, but out of what I truly want.

[Copilot]

@copilot for a new nuget regular release to be made, you must bump to v16 !

and the master branch is protected. I want a new NUGET prerelease too on each PR merge....

Done in commit chore: bump to v16, remove binary release steps from prerelease workflow:

• Version bumped to 16.0.0 (AssemblyVersion/FileVersion to 16.0.0.0) and release notes link updated to the v16 wiki page.
• The binary build, zip, and GitHub release steps have been removed from the prerelease workflow. On every push to master (i.e. every merged PR), the workflow now runs tests, packs, and publishes NuGet prerelease packages versioned 16.0.0-{sha} to GitHub Packages — nothing else.
• permissions.contents downgraded to read since the workflow no longer creates GitHub releases.

[maximilien-noal]

@copilot keep the github prerelease workflow !!

[Copilot]

@copilot keep the github prerelease workflow !!

Restored in commit chore: restore binary build and GitHub prerelease steps in prerelease workflow. The binary build, zip, and GitHub prerelease release steps are back alongside the NuGet publishing.