Synastry score and cross-aspects (public, no key)

Compatibility score and the planet-to-planet aspect grid for two birth charts, served anonymously. Aspects come back sorted by orb, tightest first, so taking the first six gives the six an embed would show. applying is true when the aspect is still closing. What stays behind a key: the per-aspect interpretations, the house overlay, composite and Davison charts, and the two natal charts themselves, all of which the authed POST /synastry returns. Either partner may set timeUnknown: true; cross-aspects survive an unknown time because they are planet to planet. This call costs 3 units of the public rate-limit bucket rather than 1, because it computes two charts and the full matrix: 10 an hour on an undeclared address, 100 per declared site, 200 per address. The response carries X-RateLimit-Cost: 3.