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>

sprint147_plan.md

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+# Sprint 147 Plan: Parser/AST Adapter Interface and Multi-Language Baselines
+
+## Context
+
+With neutral core contracts defined, Sprint 147 introduces a stable adapter
+interface for parser/AST providers and validates it with multiple languages.
+
+---
+
+## Goals
+
+1. Define adapter API boundaries for parser, AST mapping, and diagnostics
+2. Implement at least two first-class adapters (C++ plus one non-C++)
+3. Normalize adapter error surfaces and capability declarations
+4. Ensure deterministic adapter selection and routing
+
+---
+
+## Steps
+
+### Step 1709: Parser/AST adapter interface schema (10 tests)
+### Step 1710: Adapter registry and lifecycle model (10 tests)
+### Step 1711: C++ adapter conformance harness model (10 tests)
+### Step 1712: Non-C++ adapter conformance harness model (10 tests)
+### Step 1713: `whetstone_list_language_adapters` MCP tool (8 tests)
+### Step 1714: `whetstone_probe_language_adapter` MCP tool (8 tests)
+### Step 1715: `whetstone_select_language_adapter` MCP tool (8 tests)
+### Step 1716: Adapter health and conformance score model (8 tests)
+### Step 1717: Multi-adapter compatibility report artifact (8 tests)
+### Step 1718: Sprint 147 integration summary + regression (8 tests)
+
+---
+
+## Architecture Gate
+
+- Adapter interface must remain language-agnostic and versioned
+- Adapter selection must be deterministic under identical inputs
+- Conformance failures must include structured actionable diagnostics
+- Max 600 lines per header