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>

sprint70_plan.md

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+# Sprint 70 Plan: Autonomous Improvement Loop (Guardrailed)
+
+## Context
+
+With full telemetry, benchmarks, and governance in place, Sprint 70 introduces a
+guardrailed autonomous improvement loop for adapter quality.
+
+---
+
+## Goals
+
+1. Propose adapter/policy improvements from observed failures
+2. Validate proposals in sandboxed benchmark cycles
+3. Require explicit promotion approval for production adoption
+4. Track improvement ROI and rollback health
+
+---
+
+## Steps
+
+### Step 929: Improvement proposal generator from failure trends (12 tests)
+### Step 930: Sandbox trial runner for proposals (10 tests)
+### Step 931: Trial evaluation rubric (quality/risk/cost) (10 tests)
+### Step 932: Promotion gate for accepted proposals (10 tests)
+### Step 933: Auto-rollback trigger design for degraded proposals (10 tests)
+### Step 934: Improvement ROI tracker (8 tests)
+### Step 935: `whetstone_propose_adapter_improvements` MCP tool (8 tests)
+### Step 936: `whetstone_run_improvement_trial` MCP tool (8 tests)
+### Step 937: Continuous improvement program summary artifact (8 tests)
+### Step 938: Sprint 70 integration summary + regression (8 tests)
+
+---
+
+## Safety Rule
+
+- Autonomous changes cannot bypass human approval into Stable-tier pathways.