test(eval): accept a .js slice component

[angeloashmore]

Refs: #278

Description

The eval that checks for slice component implementation only checked for .tsx or .jsx. The example project writes to .js instead.

This PR updates the eval to support all three valid extensions.

Checklist

• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

How to QA ¹

In a container or a disposable VM:

$ node --run build
$ EVAL_TRIALS=5 PRISMIC_ALLOW_EVALS=true node --run evals -- \
    evals/render-content.eval.ts

🤖 Generated with Claude Code

https://claude.ai/code/session_0194f9d6dLEYage35y3snFaD

---

Note

Low Risk
Test-only change to file discovery and assertion messaging; no production or runtime behavior affected.

Overview
Updates the writes a slice component eval so it discovers generated slice React files with .js as well as .tsx and .jsx, by changing the filename regex from one that only matched tsx/jsx to /\.(tsx|jsx?)$/.

When no matching file is found, the assertion now fails with a message listing the actual files in slices/Testimonial/ to make eval failures easier to debug.

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