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>

sprint65_plan.md

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+# Sprint 65 Plan: Parallel Pair Upgrades and Queue Optimization
+
+## Context
+
+Multiple language-pair upgrades should progress concurrently without starving
+high-impact work. Sprint 65 optimizes routing and queueing for pair upgrades.
+
+---
+
+## Goals
+
+1. Introduce pair-upgrade queue with priority classes
+2. Optimize parallel execution under resource constraints
+3. Prevent starvation of critical production pairs
+4. Improve throughput while keeping quality gates strict
+
+---
+
+## Steps
+
+### Step 879: Pair-upgrade queue model (12 tests)
+### Step 880: Priority policy (`critical`, `revenue`, `coverage`, `experimental`) (10 tests)
+### Step 881: Parallel dispatch optimizer with dependency constraints (10 tests)
+### Step 882: Starvation prevention mechanism (10 tests)
+### Step 883: Queue health scoring model (10 tests)
+### Step 884: Retry/backoff strategy for unstable pairs (8 tests)
+### Step 885: `whetstone_enqueue_pair_upgrade` MCP tool (8 tests)
+### Step 886: `whetstone_get_upgrade_queue` MCP tool (8 tests)
+### Step 887: Upgrade queue observability panel model (8 tests)
+### Step 888: Sprint 65 integration summary + regression (8 tests)
+
+---
+
+## Routing Rule
+
+- Critical-tier regressions preempt all experimental upgrades.