Add archival notice: project is no longer maintained

CONTRIBUTING.md

@@ -1,33 +1,5 @@
 # Contributing
 
-## Branching and Pull Requests
-
-This project uses a trunk-based development model. `master` is the only long-lived branch.
-
-1. Create a short-lived feature branch off `master`.
-2. Open a Pull Request targeting `master`.
-3. The `CI` workflow (`build-test` job) must pass.
-4. Merges must result in linear history. Use squash or rebase merges.
-
-## Releases
-
-Releases are fully automated.
-
-* **Prereleases:** Every merge to `master` triggers the `release.yml` workflow, which publishes a prerelease NuGet package (e.g., `3.1.0-preview.0.7`). No action is required from contributors.
-* **Stable Releases:** The maintainer cuts stable releases by pushing an annotated git tag matching `vX.Y.Z` (e.g. `git tag -a v3.1.0 -m "v3.1.0" && git push origin v3.1.0`). This builds a clean `X.Y.Z` package, publishes it to NuGet, and creates a GitHub Release with auto-generated notes.
-
-## Versioning
-
-Versioning is handled automatically via [MinVer](https://github.com/adamralph/minver) based on git tags.
-
-* Do not manually edit `AssemblyVersion`, `FileVersion`, or `InformationalVersion` in the `.csproj` file.
-* Version numbers are derived from the latest git tag.
-
-## Local Development
-
-To build and test the project locally:
-
-```bash
-dotnet build
-dotnet test
-```
+ArgSentry is no longer maintained and is not accepting contributions, issues, or pull
+requests. See the [README](README.md) for details and for a suggested alternative
+(`Ardalis.GuardClauses`).

README.md

@@ -6,6 +6,13 @@ ArgSentry
 
 [![CI](https://github.com/eric-davis/ArgSentry/actions/workflows/ci.yml/badge.svg)](https://github.com/eric-davis/ArgSentry/actions/workflows/ci.yml)
 
+> **⚠️ Archived — no longer maintained.** Most of what `Prevent` does is now built into
+> .NET itself (`ArgumentNullException.ThrowIfNull`, `ArgumentException.ThrowIfNullOrEmpty`,
+> `ArgumentOutOfRangeException.ThrowIfGreaterThan`, etc., .NET 6/8+). For the rest
+> (collection/Guid/default-value checks), see [Ardalis.GuardClauses](https://github.com/ardalis/GuardClauses),
+> which is actively maintained. This package will remain on NuGet as-is for existing
+> consumers, but there will be no further updates, bug fixes, or releases.
+
 ArgSentry is a .NET / .NET Core utility library for validating method argument values.