Document functional-language rewrite spike outcome and recommended first POC scope

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This spike asked for a practical direction on rewriting part of iRonoc with a functional language, comparing Scala, Kotlin, and external-language options. The update captures a bounded recommendation that can be executed incrementally without broad architectural churn.

• ## Spike outcome captured in README

  • Added a dedicated Spike: functional language rewrite candidate section to README.md.
  • Documented tradeoffs across:
    • Scala (strong FP model, higher adoption/build complexity)
    • Kotlin (best JVM-native incremental fit)
    • External runtimes (Rust/Go/Dart/Flutter/Python via service boundary, with added ops/network overhead)

• ## Recommended implementation slice

  • Identified a concrete first candidate: GitDetailsService mapping methods that are primarily pure transformations:
    • mapRepositoriesToResponse
    • mapResponseToRepositories
    • mapIssuesToResponse
  • Recommendation in-doc: run a Kotlin POC on this mapping layer first, then expand only if maintainability/testability gains are demonstrated.

## Spike: functional language rewrite candidate
- Candidate scope for a first rewrite: `GitDetailsService` data-mapping methods ...
- Scala: strongest FP ecosystem, but introduces a larger adoption curve ...
- Kotlin: best incremental JVM fit ...
- External languages ... viable only behind a service boundary ...
- Recommendation: run a Kotlin proof-of-concept for the `GitDetailsService` mapping layer first ...

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[Copilot]

Pull request overview

Documents the outcome of a spike exploring a functional-language rewrite path, and records a bounded, incremental recommendation for a Kotlin proof-of-concept focused on pure mapping logic in GitDetailsService.

Changes:

• Added a new README section capturing the spike outcome and tradeoffs across Scala, Kotlin, and external runtime options.
• Documented a recommended first Kotlin POC scope targeting GitDetailsService’s mapping methods as an incremental, low-churn starting point.

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