docs: Add session summary for 2026-02-01
- Parabolic orbit handling improvements (Barker's equation, test fixes)
- Added 16 formula comments to orbital_mechanics.cpp
- Tightened parabolic boundary test tolerances
- Test suite: 82 → 93 tests passing
- Documentation streamlined (newton_raphson_test_plan.md: 379 → 161 lines)
- Net line change: -205 lines
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