Add .NET Framework 4.7.2 Inspector support

[miloszkukla]

Important

This is the base of the code stack. Please merge it with a merge commit so #18 and #21 retain the same shared commit IDs and their cumulative diffs shrink without cherry-picking.

Summary

• add net472 to the Shared and Inspector target framework matrices
• keep InjectorHelper on net8.0; it launches and injects the Inspector but is not referenced by target applications
• apply the existing .NET Framework package and WPF references to both net472 and net48
• add a Shared-only test project that runs unchanged tests against net472, net48, and net8.0
• document the Inspector's supported self-hosting targets

Why

A .NET Framework 4.7.2 WPF project cannot reference the existing net48 Inspector target at compile time. Adding a dedicated net472 target enables self-hosting without retargeting the application.

This keeps net48 rather than replacing it, preserving the existing injection payload and making support for .NET Framework 4.7.2, .NET Framework 4.8, and .NET 8 explicit.

Validation

• dotnet build src/WpfVisualTreeMcp.Inspector/WpfVisualTreeMcp.Inspector.csproj --configuration Release --framework net472 — succeeded with 0 errors
• dotnet build WpfVisualTreeMcp.sln --configuration Release — succeeded with 0 errors and compiled every declared Shared and Inspector target
• WpfVisualTreeMcp.Shared.Tests — 19 passed on each of net472, net48, and net8.0
• remaining existing tests — 55 passed
• clean temporary merge with Fix Auto-injection packaging for release artifacts #18; combined Release solution build succeeded with 0 errors
• combined native bootstrapper builds succeeded for x64 and Win32; the local v145 override was command-line only and the project remains on v143
• combined server publish and NuGet pack succeeded; the package retains the net48 Inspector, dependency closure, and native bootstrapper under both native/x64 and native/x86
• git diff --check

[Copilot]

Pull request overview

Adds explicit .NET Framework 4.7.2 support to the Inspector + Shared libraries so older WPF apps can self-host the Inspector via project reference, and introduces a Shared-only test project to validate behavior across net472/net48/net8.0.

Changes:

• Multi-target WpfVisualTreeMcp.Shared and WpfVisualTreeMcp.Inspector for net472 alongside existing net48 and net8.0(-windows) targets, including framework-conditional references/packages.
• Add WpfVisualTreeMcp.Shared.Tests to run Shared regression tests across net472, net48, and net8.0.
• Update docs to describe the Inspector’s supported self-hosting target frameworks; simplify Injector to net8.0 only.

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
WpfVisualTreeMcp.sln	Adds the new Shared-only test project to the solution.
tests/WpfVisualTreeMcp.Shared.Tests/WpfVisualTreeMcp.Shared.Tests.csproj	New multi-targeted test project validating Shared across net472/net48/net8.0.
tests/WpfVisualTreeMcp.Shared.Tests/SharedModelsTests.cs	New Shared model construction/assertion tests.
tests/WpfVisualTreeMcp.Shared.Tests/IpcSerializerTests.cs	New IPC envelope regression tests (multi-targeted).
src/WpfVisualTreeMcp.Shared/WpfVisualTreeMcp.Shared.csproj	Adds net472 target and applies .NET Framework package refs to both net472 and net48.
src/WpfVisualTreeMcp.Inspector/WpfVisualTreeMcp.Inspector.csproj	Adds net472 target and applies explicit WPF refs to both net472 and net48.
src/WpfVisualTreeMcp.Injector/WpfVisualTreeMcp.Injector.csproj	Simplifies Injector to target net8.0 only.
README.md	Documents Inspector’s multi-target support and updates the repo tree description.

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[miloszkukla]

Assessed in consolidated PR #22 and intentionally unchanged. Injector no longer references the Windows-targeted Inspector assembly; moving Injector to net8.0-windows would also force the referencing Server/tool TFM to change. The Windows runtime requirement is documented explicitly.

[miloszkukla]

Superseded by #22, which consolidates the full change set and incorporates the applicable review feedback. Closing this stacked PR to avoid duplicate review threads and workflow ambiguity.