Fix #4787 — consume JasperFx 2.18.1 (DI-projection partial-class dispatch)

[jeremydmiller]

Consumes the JasperFx 2.18.1 source-generator fix from jasperfx#481 that lands the partial-class override emission path for DI-only-ctor projections.

What this closes

A partial SingleStreamProjection<T, TId> registered via AddProjectionWithServices with constructor-injected dependencies and conventional instance methods (Create / Apply / ShouldDelete) had its injected fields silently NULL inside every convention method on Marten 9.11+ / JasperFx.Events 2.14.x+. The reporter's _sender?.SendAsync(...) null-conditional masked the resulting NRE as silent zero events.

How JasperFx 2.18.1 fixes it

The 2.14.1 fallback in EvolverCodeEmitter closed CS7036 for DI-only-ctor projections at compile time but left every injected field NULL at runtime — the file-scoped Evolver built its private shadow projection via RuntimeHelpers.GetUninitializedObject and dispatched every Apply / Create / ShouldDelete through it, so the DI-resolved projection that AddProjectionWithServices supplied was never used for event dispatch.

2.18.1 emits a [GeneratedCode]-attributed override (Evolve / EvolveAsync / DetermineActionAsync — picked by HasShouldDelete / HasAnyAsync exactly like the existing file-scoped Evolver) directly into the user's partial class. Body uses bare convention-method calls so dispatch binds to this — the DI-built instance with all injected fields populated. The [assembly: GeneratedEvolver(...)] attribute and the file sealed class Evolver are NOT emitted for this case — the runtime's isOverridden(...) precedence picks up the partial-class override before tryUseAssemblyRegisteredEvolver ever runs.

Stateless / parameterless-ctor / aggregate-only / static-only projections keep the file-scoped Evolver verbatim — no perf or shape change for cases that don't need DI.

Changes

• Directory.Packages.props: JasperFx + JasperFx.Events + both source generators 2.18.0 → 2.18.1.
• src/ContainerScopedProjectionTests/Bug_4787_di_projection_with_instance_apply.cs: regression suite — 9 cases covering {Apply, Create, ShouldDelete} × {Singleton, Scoped, Transient}. All 9 failed on 2.18.0 with NRE through the shadow instance. All 9 pass on 2.18.1. Originally on the repro branch repro/4787-di-projection-ctor-skipped — now promoted to the regression suite in the project that exercises AddProjectionWithServices end-to-end.

Test plan

• 9/9 Bug_4787 cases green on net10 against published JasperFx 2.18.1.
• CI matrix (PG 15/latest × net8/net10 × Newtonsoft/STJ).

Closes #4787

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