Deprecate CommunityToolkit Bun hosting integration in favor of core Aspire.Hosting.JavaScript

[Copilot]

Aspire now provides first-class Bun support via Aspire.Hosting.JavaScript (AddBunApp), so the Toolkit Bun integration should guide users to migrate off the Toolkit package. This PR deprecates the Toolkit surface and updates package/docs with explicit migration guidance.

• API deprecation

  • Marked Toolkit Bun extension methods as [Obsolete] with a migration message:
    • AddBunApp(...)
    • WithBunPackageInstallation(...)
  • Updated the generated API metadata file to reflect the same obsolete annotations.

• Package deprecation signaling

  • Updated NuGet package metadata for CommunityToolkit.Aspire.Hosting.Bun:
    • Added deprecated package tag
    • Updated package description to indicate migration target (Aspire.Hosting.JavaScript) and planned removal.

• Docs and migration guidance

  • Added a deprecation notice to Bun README.
  • Added explicit migration guidance from Toolkit API shape to core API shape.
  • Included TypeScript AppHost migration example using generated core bindings (builder.addBunApp(...)).
  • Updated root repository integration table entry for Bun to indicate deprecation and point to core API.

• Compatibility posture

  • Kept the Toolkit API operational (deprecated, not removed) to provide a compatibility window while steering users to the core integration.

// Toolkit (deprecated)
builder.AddBunApp("api", "server.ts")
    .WithHttpEndpoint(env: "PORT");

// Core replacement
builder.AddBunApp("api", "./api", "server.ts")
    .WithHttpEndpoint(env: "PORT")
    .WithExternalHttpEndpoints();

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/CommunityToolkit/Aspire/main/eng/scripts/dogfood-pr.sh | bash -s -- 1376

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/CommunityToolkit/Aspire/main/eng/scripts/dogfood-pr.ps1) } 1376"

[Copilot]

Pull request overview

This PR deprecates the Toolkit Bun hosting integration in favor of Aspire’s core JavaScript hosting support, while keeping the current API available during the migration window.

Changes:

• Adds obsolete annotations to Bun hosting extension methods and API metadata.
• Updates NuGet/package README/root README deprecation messaging.
• Suppresses obsolete warnings in Bun examples/tests and adds reflection coverage for deprecation attributes.

Show a summary per file

File	Description
src/CommunityToolkit.Aspire.Hosting.Bun/BunAppExtensions.cs	Adds deprecation message and obsolete annotations to Bun extension methods.
src/CommunityToolkit.Aspire.Hosting.Bun/api/CommunityToolkit.Aspire.Hosting.Bun.cs	Mirrors obsolete annotations in generated API metadata.
src/CommunityToolkit.Aspire.Hosting.Bun/CommunityToolkit.Aspire.Hosting.Bun.csproj	Updates package tags and description to signal deprecation.
src/CommunityToolkit.Aspire.Hosting.Bun/README.md	Adds deprecation notice and migration examples.
README.md	Marks the Bun integration as deprecated in the root integration table.
examples/bun/CommunityToolkit.Aspire.Hosting.Bun.AppHost/Program.cs	Suppresses obsolete warnings for the example AppHost.
tests/CommunityToolkit.Aspire.Hosting.Bun.Tests/AddBunAppTests.cs	Suppresses obsolete warnings and adds deprecation attribute assertions.

Copilot's findings

• Files reviewed: 7/7 changed files
• Comments generated: 2

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
CommunityToolkit.Aspire.Hosting.Bun	88%	69%	20	✔
Summary	88% (29 / 33)	69% (11 / 16)	20	✔

Minimum allowed line rate is 60%