[mysticmind]

Two [BoundaryModel] parameters of the same type on one chain (e.g. Validate plus Handle) used to each add a LoadBoundaryFrame, emitting duplicate var eventBoundaryOf<TAggregate> = ... declarations and failing codegen with CS0128. Modify() now reuses an existing frame for the same aggregate type.

Regression test added in MartenTests/Dcb.

[Copilot]

Pull request overview

This PR fixes a Marten DCB code generation regression where multiple [BoundaryModel] parameters for the same aggregate type in one handler chain produced duplicate boundary loader declarations.

Changes:

• Exposes LoadBoundaryFrame.AggregateType for matching existing loaders.
• Reuses an existing Marten boundary loader for the same aggregate type instead of adding duplicates.
• Adds a Marten regression test covering Validate + Handle with duplicate boundary model parameters.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Persistence/Wolverine.Marten/Codegen/LoadBoundaryFrame.cs	Exposes aggregate type and uses it during generated boundary fetch code.
src/Persistence/Wolverine.Marten/BoundaryModelAttribute.cs	Adds per-chain, per-aggregate deduplication for Marten boundary loader middleware.
src/Persistence/MartenTests/Dcb/dedup_load_boundary_frame_tests.cs	Adds an end-to-end regression test for two [BoundaryModel] parameters on one chain.

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[jeremydmiller]

Superseded by #2977, which keeps this dedup fix (with @mysticmind's commits retained as-authored) and adds the IL2062/IL2065/IL3050 trim suppressions on Wolverine.Polecat/BoundaryModelAttribute.Modify that the build + Polecat test jobs were failing on (matching the existing Marten sibling). Verified: Polecat builds clean on net9.0 + net10.0 and the full wolverine.slnx Release build is green.

[jeremydmiller]

Closing in favor of #2977, which retains @mysticmind's commits and adds the trim-suppression fix for the failing CI build.