Add fail-closed GTH transferability matrix

[benjipeng]

Summary

• add a hash-pinned s/p/d GTH transferability matrix with independent coverage, science, and identity outcomes
• add a reusable reciprocal-symmetry basis transform and retain the efficient two-atom primitive MgO q10 protocol
• preserve the failed q10 feasibility result and existing MgO q2 science residuals instead of loosening thresholds
• add d-channel nonlocal force derivative coverage and document the remaining production blockers

Verification

• 12 primitive geometry, symmetry, workload, and existing Iron symmetry tests passed
• 6 transferability matrix and d-channel force tests passed
• ruff check src tests scripts
• static API documentation generation
• canonical site documentation sync check

Scientific status

Coverage is complete, but strict science and complete historical identities remain blocked; the report intentionally returns production_envelope_verified=false.