# Sprint 53 Plan: Typed OO/Functional Family (.NET + JVM Extended)

## Context

Sprint 53 focuses on high-value enterprise languages with strong type systems:
Kotlin, C#, F#, VB.NET, and deep JVM/.NET interop semantics.

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## Goals

1. Add full adapter support for Kotlin, C#, F#, VB.NET
2. Preserve nullability and async model intent across targets
3. Support interface/trait/ADT mappings with minimal semantic loss
4. Stabilize JVM/.NET family support to Beta tier

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## Steps

### Step 759: Kotlin lowering/raising adapters (12 tests)
### Step 760: C# lowering/raising adapters (10 tests)
### Step 761: F# lowering/raising adapters (10 tests)
### Step 762: VB.NET lowering/raising adapters (10 tests)
### Step 763: Nullability + optionality canonical model bridge (10 tests)
### Step 764: Async model bridge (`Task`, coroutines, futures) (10 tests)
### Step 765: ADT + pattern matching canonical lowering (8 tests)
### Step 766: `whetstone_transpile_managed_family` MCP tool (8 tests)
### Step 767: Family promotion checks (experimental->beta) (8 tests)
### Step 768: Sprint 53 integration summary + regression (8 tests)

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## Promotion Target

- Kotlin, C#, F# at Beta for approved pair matrix
- VB.NET at Experimental/Beta by feature subset