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>

sprint133_plan.md

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+# Sprint 133 Plan: MCP Tool Contract Conformance and Schema Drift Prevention
+
+## Context
+
+Tool names alone are insufficient; input/output contracts must remain stable.
+Sprint 133 enforces deterministic contract conformance for MCP tools.
+
+---
+
+## Goals
+
+1. Model and validate tool input/output contracts as first-class artifacts
+2. Detect contract drift against baselines with structured diffs
+3. Gate contract-breaking changes behind explicit compatibility policy
+4. Export conformance reports for release workflows
+
+---
+
+## Steps
+
+### Step 1569: MCP tool contract schema v1 model (10 tests)
+### Step 1570: Input schema canonicalization model (10 tests)
+### Step 1571: Output payload shape profiler model (10 tests)
+### Step 1572: Contract drift classifier (`compatible`, `warning`, `breaking`) (10 tests)
+### Step 1573: `whetstone_export_tool_contracts` MCP tool (8 tests)
+### Step 1574: `whetstone_validate_tool_contracts` MCP tool (8 tests)
+### Step 1575: Compatibility waiver policy bindings (8 tests)
+### Step 1576: Contract conformance score model (8 tests)
+### Step 1577: Contract conformance report artifact (8 tests)
+### Step 1578: Sprint 133 integration summary + regression (8 tests)
+
+---
+
+## Architecture Gate
+
+- Contract canonicalization must be deterministic
+- Breaking changes must emit explicit structured reasons
+- Validation outputs must remain machine-readable and auditable
+- Max 600 lines per header