fix: remove strict mode and add serializer options for concerto v4

[rockaxorb13]

fixes #136

This PR fixes the first and second problems listed in #136, as directed by @mttrbrts, these changes did not break the v3 build and as per my understanding, the strict : true parameter for modelManager was mostly redundant.

For the serializer API changes I updated Serializer.fromJSON() calls, adding an option:
({ validate: true, acceptResourcesForRelationships: false });
This satisfies v3's strict TypeScript requirements for the SerializerOptions interface while preparing the calls for v4's updated signature where these options are made optional.

Updated snapshots to adjust these changes.

[Copilot]

Pull request overview

Updates template-engine to better align with Concerto v4 API changes by removing deprecated ModelManager strict-mode usage and adding explicit serializer option objects to relevant deserialization calls.

Changes:

• Remove { strict: true } from ModelManager instantiations (tests + interpreter internal validation helpers).
• Update Serializer.fromJSON(...) call sites to pass an explicit SerializerOptions object.
• Update Jest snapshots to match the new diagnostics output.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/TemplateMarkInterpreter.ts	Removes ModelManager strict mode and adds serializer options for validation/deserialization.
test/TemplateMarkInterpreter.test.ts	Removes strict mode from ModelManager in interpreter integration tests.
test/HelloWorld.test.ts	Removes strict mode from ModelManager in hello-world test setup.
test/GenerateOptions.test.ts	Removes strict mode from ModelManager in generation options tests.
test/CustomTemplateModel.test.ts	Removes strict mode from ModelManager in custom model test setup.
test/__snapshots__/TemplateMarkInterpreter.test.ts.snap	Snapshot updates reflecting changed error locations/output.

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