Adds the Calculation pseudo-driver (tags computed by C# scripts over other tags' live
values) plus the host seam that feeds it:
- IDependencyConsumer capability interface (Core.Abstractions) + DriverTypeNames.Calculation.
- CalculationDriver : IDriver, ISubscribable, IReadable, IDependencyConsumer — change-gate +
dedupe (VirtualTagActor parity), timer-group scheduler, Bad-transition + script-log emission,
Good recovery; reuses the T0-4 CalculationEvaluator.
- DriverHostActor spawns a DependencyConsumerMuxAdapter per dependency-consuming driver,
registering its refs on the per-node DependencyMuxActor and forwarding DependencyValueChanged
→ OnDependencyValue; re-registers on every apply, torn down with the driver.
- Factory + probe registered in DriverFactoryBootstrap (keeps the T0-3 guard green); guard test
csproj references the driver so the bin-scan discovers the factory.
- DeploymentArtifact injects the resolved scriptSource (scriptId → SourceCode) into a calc tag's
delivered TagConfig so the host-blind driver can compile it.
- DraftValidator deploy gates: CalculationScriptMissing / CalculationScriptNotFound (scriptId
existence) + CalculationDependencyCycle (DependencyGraph.DetectCycles over calc→calc edges).
- Tests: driver units (dep-ref extraction, change-gate, dedupe, Bad+script-log+recovery, timer,
read), tag-config parsing, DraftValidator gates (self/2-cycle/cross-driver-terminal), and a
Runtime integration test proving values FLOW mux → adapter → driver → calc-of-calc end-to-end.
Claude-Session: https://claude.ai/code/session_01LVneM3eh1UtJxEisFXgmox
New Driver.Calculation project + CalculationEvaluator, mirroring the
VirtualTag RoslynVirtualTagEvaluator: source-hash compile cache
(CompiledScriptCache), 2 s TimedScriptEvaluator, passthrough fast-path,
single-tag mode (ctx.SetVirtualTag dropped + logged), sandbox/compile/
timeout/throw all surfaced as VirtualTagEvalResult.Failure for WP7 to map
to Bad quality. IScriptCacheOwner.ClearCompiledScripts for the deploy
generation boundary. 11 parity unit tests. Both projects added to the
solution. Evaluator + tests only — driver shell / registration is WP7.
Claude-Session: https://claude.ai/code/session_01LVneM3eh1UtJxEisFXgmox
Joseph Doherty