RoslynVirtualTagEvaluator wraps Core.Scripting.ScriptEvaluator + Core
.VirtualTags.VirtualTagContext into a single-tag IVirtualTagEvaluator
adapter. Caches the compiled ScriptEvaluator per unique expression so
the second-and-onwards Evaluate is an in-process method call against the
dependency dictionary. Compile/sandbox/runtime errors all surface as
VirtualTagEvalResult.Failure rather than propagating exceptions through
the VirtualTagActor message loop.
Single-tag scope: cross-tag ctx.SetVirtualTag writes are dropped + logged
because fan-out between actors is owned by DependencyMuxActor. Cycle
detection + cascade ordering stay in Core.VirtualTags.VirtualTagEngine
where they belong (loaded fleet-wide); this adapter keeps the actor
message handler simple.
Host adds Core.Scripting + Core.VirtualTags project refs, plus a
TargetWarningsAsErrors NU1608 suppression — Microsoft.CodeAnalysis.CSharp
.Scripting 4.12.0 pins Common to 4.12.0 but ASP.NET Core transitively
brings Microsoft.CodeAnalysis.Common 5.0.0; the surface we use is stable
across the drift (verified by Core.Scripting.Tests).
Program.cs binds RoslynVirtualTagEvaluator → IVirtualTagEvaluator on
driver-role hosts, replacing the F8-default NullVirtualTagEvaluator so
VirtualTagActor evaluates real user scripts at runtime.
6 new adapter tests cover: simple expression sums, cache reuse across
calls, compile-error denial, runtime-throw denial, empty-expression
denial, post-dispose denial. Host.IntegrationTests now 10/10 green.
Closes#79. F9b + #107 next.
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