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>

sprint57_plan.md

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+# Sprint 57 Plan: Low-Level and Interop Family (C, WASM, x86, ARM)
+
+## Context
+
+Low-level code needs ABI, memory-layout, and calling-convention preservation.
+Sprint 57 focuses on interop-safe projection and verification.
+
+---
+
+## Goals
+
+1. Add ABI-aware lowering/raising for C and assembly-family inputs
+2. Model calling conventions and memory layout explicitly
+3. Support WASM projection profiles and host boundary mappings
+4. Gate unsafe low-level transforms with strict review requirements
+
+---
+
+## Steps
+
+### Step 799: ABI and calling-convention canonical model (12 tests)
+### Step 800: C interop adapter deepening (10 tests)
+### Step 801: WASM lowering/raising adapters v2 (10 tests)
+### Step 802: x86 assembly lowering adapter v1 (10 tests)
+### Step 803: ARM assembly lowering adapter v1 (10 tests)
+### Step 804: Memory layout compatibility checker (10 tests)
+### Step 805: Host boundary + FFI contract generator (8 tests)
+### Step 806: `whetstone_transpile_low_level_family` MCP tool (8 tests)
+### Step 807: Low-level acceptance report + waiver system (8 tests)
+### Step 808: Sprint 57 integration summary + regression (8 tests)
+
+---
+
+## Safety Rule
+
+- Any calling-convention or memory-layout mismatch is blocking by default.