Run2 scala data abstractions

Idiomatic data modeling with case classes, sealed traits, and exhaustive matching.From its SKILL.md

Install

npx -y skills add cxcscmu/SkillLearnBench --skill run2_scala-data-abstractions

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SKILL.md

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Sealed Hierarchy: Ensure all subtypes are known at compile time for exhaustive pattern matching.
```
sealed trait TokenValue
case class StringValue(s: String) extends TokenValue
```
Case Classes: Use for data containers. They provide equals, hashCode, copy, and constructor-based pattern matching out of the box.
Collections: Prefer immutable.Seq, Vector, or List for functional transformations. Use view for lazy operations.

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