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>

sprint68_plan.md

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+# Sprint 68 Plan: Corpus Expansion and Gold Standard Benchmarks
+
+## Context
+
+Long-term quality depends on a representative corpus. Sprint 68 creates a broad,
+versioned benchmark corpus across paradigms and pair classes.
+
+---
+
+## Goals
+
+1. Build and version gold corpora by language family
+2. Add benchmark tiers (unit, module, service, legacy project)
+3. Support reproducible benchmark replay
+4. Publish benchmark-driven pair scorecards
+
+---
+
+## Steps
+
+### Step 909: Corpus manifest schema v1 (12 tests)
+### Step 910: Corpus ingestion tooling and normalization (10 tests)
+### Step 911: Gold benchmark curation pipeline (10 tests)
+### Step 912: Replay runner with deterministic seeds/artifacts (10 tests)
+### Step 913: Benchmark scorecard generator per pair (10 tests)
+### Step 914: Corpus version diff and migration tools (8 tests)
+### Step 915: `whetstone_run_pair_benchmark` MCP tool (8 tests)
+### Step 916: `whetstone_get_pair_scorecard` MCP tool (8 tests)
+### Step 917: Benchmark publication bundle (8 tests)
+### Step 918: Sprint 68 integration summary + regression (8 tests)
+
+---
+
+## Benchmark Rule
+
+- Stable-tier promotions require passing the current gold benchmark set.