WIP: stage all uncommitted work — sprints 46-221, graduation headers, specialist fleet, test steps 909-1988

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sprint53_plan.md

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