Task 543: vec3.rs + EP02 Article Content Tests

Status: DONE

Summary

Rust vec3.rs (3 new tests, 10→13)

1. cross_raw_with heterogeneous types: Km × KmPerSec (angular momentum)
2. dot_raw orthogonal: perpendicular vectors give zero
3. scale negative and zero: sign flip and zero vector

EP02 article content (3 new tests, 34→37)

1. Prograde-only capture ΔV impossibility: ~74 km/s (key physics argument)
2. Enceladus orbital period: ~32.9 hours from calculation
3. Trim-thrust primary angle: 80.5° (nearly tangential, fuel-efficient)

Impact

vec3.rs now covers the previously untested cross_raw_with heterogeneous method and edge cases. EP02 article validation now pins critical impossibility argument (74 km/s capture ΔV), Enceladus period, and thrust angle from calculations.