[lahma]

Packaging follow-ups for 4.0.

Spring.Testing.Microsoft gets a net10.0 build next to netstandard2.0 and net472, like the other libraries.

• MSTest.TestFramework 4.5.2 ships net462, net8.0, net9.0 and netstandard2.0 assets, so no conditions are needed.
• Spring.Testing.Microsoft.Tests now runs against the net10.0 build.
• BreakingChanges items 8 and 9 are updated.

Every package now has its own NuGet README and real tags.

• Each of the 12 packages has a README.md, packed as the package readme. src/Directory.Build.props packs it only when the file exists. Each README covers:
  • what the package is;
  • the install line;
  • target frameworks;
  • one minimal snippet;
  • links, including BreakingChanges for 3.x users.
• spring-reviewer checked every type, member, XML element, attribute and namespace URI in the snippets against the code.
• PackageTags is now spring;springframework;ioc;di plus terms per package, in place of Library.
• The Messaging and Nms descriptions are corrected.

The packages are now checked against 3.1.0 when they're packed.

• EnablePackageValidation is on, with PackageValidationBaselineVersion 3.1.0. All 12 package ids exist at 3.1.0.
• There are 145 suppressions, in src/Spring/*/CompatibilitySuppressions.xml. 3.1.0 shipped net462, which is not compatible with net472, so NuGet compares 3.1.0's net462 build with 4.0's netstandard2.0 build. Every entry comes from that pairing:
  • CP0008: _Exception/_Attribute interfaces that the netstandard2.0 build doesn't implement.
  • CP0001: types that are net472-only in both versions, such as CallContextStorage, ServiceDomain* and OpenSessionInViewModule.
  • PKV006: the dropped net462 build, and Spring.Testing.NUnit's dropped netstandard2.0 build (item 9).
• The two netstandard2.0 builds are compared with no suppressions. Nothing was found that BreakingChanges.txt doesn't cover.
• Spring.Messaging keeps validation off, with a comment. Its netstandard2.0 build (Experimental.System.Messaging) and its net472 build (System.Messaging) differ by design, as they did in 3.x.
• Known gaps, documented in AGENTS.md:
  • The net472-only packages (Web, Mvc5, Web.Conversation, and Testing.NUnit's net472 build) get no comparison against 3.1.0, and no net472 build does.
  • A direct dotnet pack outside Fallout needs -p:AssemblyVersion=<major>.<minor>.0.0.
  • Both gaps close when the baseline moves to 4.0.0 after release.

Verification

• ./build.cmd Compile Pack --skip CompileExamples passes with validation on. This was after rebasing onto Remove the ASMX web service exporter from Spring.Web #384 and Examples: remove stale Common.Logging config and legacy Northwind web.config variants #385. Spring.Web's suppressions were unchanged.
• All 12 nupkgs carry README.md, the new tags and the expected lib/ folders.
• Spring.Testing.Microsoft.Tests: 4/4 on net10.0 and 4/4 on net472.
• dotnet build Spring.Net.sln -c Debug: clean.
• spring-reviewer accepted it, with follow-ups that are now in the last commit: the Conversation README setup, missing usings, Microsoft.Data.SqlClient on modern .NET, and the AGENTS.md notes.

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