feat(rate-web): execute localized torque variation

[d-sorgcodexagent]

Summary

• execute authored localized shoulder/wrist torque factors through the React production Worker using Python-matched passive RK4 semantics
• enforce canonical effective duration, exact state/torque grids, typed hit/no-impact/failure authority, deep request/result/document binding, and setup-derived contact geometry
• add strict schema-v2 JSON plus formula-neutralized provenance CSV exports and accessible localized source labels
• preserve bounded confidence-ellipsoid meshes and the full parent stack from feat(variation): render bounded confidence ellipsoid meshes #4416

Verification

• 874 React tests and 6 real Chromium production-Worker workflows on integrated head
• localized execution: 275 selected Rate/variation Python + 167 shared swing tests (one expected Rust-wheel skip)
• mesh/policy: 74 focused Python tests
• exact Python3.12/Mypy1.13, assertion policy, TypeScript/ESLint/Vite, Ruff/format, docs/size/diff
• independent exact-head and integrated-head GO reviews

Stack

Draft child of #4416. Current Variation UI/Worker execution is passive-only; prescribed addition is kernel-golden/unit tested but has no production transport. Rust localized parity, complete raw RK4 half-step archive, cross-browser/AT certification, approved baselines, and remaining #4142 work stay open.