New pages:
- OD function reference (tle_from_eci, tle_from_topocentric,
tle_from_angles, tle_fit_residuals)
- OD guide (ECI, topocentric, angles-only, range rate, weights,
multi-observer, covariance interpretation)
- From find_orb to SQL (OD workflow comparison)
- From Poliastro to SQL (Lambert/Kepler comparison)
Updated pages:
- Corrected stale "No orbit determination" claim
- Updated function counts and test suite counts
- Added v0.4.0-v0.6.0 upgrade paths
- Added OD to capabilities table, theory-to-code mapping,
constants/accuracy reference
- Added OD examples to Skyfield comparison and SQL Advantage
- Fixed stale version references across workflow pages