Isolate optional Kotlin run markers to preserve Java error highlighting

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Installing JBang can prevent normal Java modules from highlighting unresolved methods in IntelliJ 2026.2.3, alongside a reported line-marker class-loading exception.

• Dependency isolation: Move Kotlin PSI references into JBangKotlinRunLineMarker, registered only through the optional Kotlin descriptor. Keep Java/Groovy markers independent of Kotlin.
• Behavior preservation: Retain shared directive/shebang handling and Kotlin class/main gutter markers.
• Regression coverage: Add unresolved-method highlighting and Kotlin-unavailable classloader tests; strengthen Kotlin declaration gutter assertions.
• Changelog: Document the highlighting fix under Unreleased.

• Fixes [IntelliJ 2026.2.3] Plugin disables error highlighting for normal Java modules #184

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