feat: add Husky.Net README badge sync hook and clean up 3-Series leftovers

[jkdevito]

Summary (what/why):

• Adds Husky.Net pre-commit hook that syncs README badges.
• Installs git hooks automatically on folder open in VS Code.
• Documents Husky.Net setup/usage in README.
• Removes unused CI scripts and 3-Series leftovers.
• Ignores *.code-workspace.
• Updates copyright year.

Testing: not run beyond local hook install.

Notes for reviewers: 15 files changed (+223/-266); contributors need dotnet tool restore && dotnet husky install (runs automatically via VS Code task).

[Copilot]

Copilot review overview

🟡 Changes recommended

The misplaced tool manifest prevents hook installation, and the hook can unintentionally stage unrelated README edits.

Review effort: Balanced
Findings: 2 · 1

Open (3)

• Stage mode includes unrelated README changes and stale badge inputs · New
• Local tool manifest is misplaced, preventing tool restore · New
• Check command requires undocumented PowerShell 7 on Windows · New

What changed in this PR

Adds Husky.Net automation to synchronize README badges while removing legacy 3-Series and CI artifacts.

Changes:

• Adds badge synchronization and automatic hook installation.
• Documents hook setup and usage.
• Removes obsolete 3-Series and CI files.

File	Description
src/​epi-make-model.4Series.csproj	Updates copyright year.
src/​epi-make-model.3Series.csproj	Removes legacy project.
src/​Directory.Build.targets	Adds hook installation target.
README.md	Adds badges and hook documentation.
GetPackages.BAT	Removes obsolete package script.
dotnet-tools.json	Declares Husky.Net tool.
.vscode/​tasks.json	Adds folder-open hook installation.
.vscode/​settings.json	Removes color customization.
.husky/​task-runner.json	Configures badge synchronization.
.husky/​pre-commit	Runs Husky tasks before commits.
.gitignore	Ignores workspace files.
.github/​scripts/​ZipBuildOutput.ps1	Removes unused packaging script.
.github/​scripts/​UpdateAssemblyVersion.ps1	Removes legacy version script.
.github/​scripts/​Update-ReadmeBadges.ps1	Implements badge synchronization.
.github/​scripts/​GenerateVersionNumber.ps1	Removes legacy version generator.

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[Copilot]

Copilot review overview

🟡 Changes recommended

The hook can derive badges from uncommitted files or silently fail to stage them, and VS Code installation is not reliable with Windows PowerShell 5.1.

Review effort: Balanced
Findings: 2

Open (2)

• Guard against untracked files used for badge generation · New
• Local tool manifest is misplaced, preventing tool restore

Resolved since last review (2)

• Stage mode includes unrelated README changes and stale badge inputs
• Check command requires undocumented PowerShell 7 on Windows

Previously missed (2)

In code that hasn't changed since last review

Handle git add failures to prevent stale badge commits

.github/​scripts/​Update-ReadmeBadges.ps1:109

A failed git add is a native-command failure and is not converted into a terminating PowerShell error by $ErrorActionPreference. The script can therefore report success to Husky without staging the updated README (for example, when the index is locked), allowing a stale badge commit. Check $LASTEXITCODE and fail the hook.

Pin VS Code task shell to PowerShell 7

.vscode/​tasks.json:7

This folder-open task uses whichever shell VS Code selected. On Windows that may still be Windows PowerShell 5.1, where && is a syntax error, even when the required pwsh executable is installed. Pin the task shell to PowerShell 7 so the advertised automatic install works independently of the user's default terminal profile.