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>

sprint76_plan.md

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+# Sprint 76 Plan: HPC and Scientific Computing Semantics Pack
+
+## Context
+
+HPC/scientific workloads require numerical stability and performance fidelity.
+Sprint 76 adds numerical and parallel-compute semantics and gates.
+
+---
+
+## Goals
+
+1. Model numerical stability and precision semantics
+2. Preserve parallel compute intent and data partitioning behavior
+3. Add scientific reproducibility checks to migration contracts
+4. Support HPC-target optimization profiles with safety guards
+
+---
+
+## Steps
+
+### Step 989: Numerical stability canonical model (12 tests)
+### Step 990: Precision/roundoff risk packet model (10 tests)
+### Step 991: Parallel partitioning semantics model (10 tests)
+### Step 992: Scientific reproducibility runner integration (10 tests)
+### Step 993: HPC optimization profile policies (10 tests)
+### Step 994: Numerical regression gate integration (8 tests)
+### Step 995: `whetstone_verify_scientific_migration` MCP tool (8 tests)
+### Step 996: `whetstone_get_numerical_risk_report` MCP tool (8 tests)
+### Step 997: HPC migration playbook template (8 tests)
+### Step 998: Sprint 76 integration summary + regression (8 tests)
+
+---
+
+## Scientific Rule
+
+- Numerically unstable projections cannot promote above Beta without waivers.