# 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.

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## 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

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## 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)

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## Scientific Rule

- Numerically unstable projections cannot promote above Beta without waivers.