Render a deterministic synastry double wheel

Returns an original 1200 by 1120 SVG in JSON. Person A supplies inner houses; major cross-chart aspects are optionally drawn. Opt-in include_png returns a deterministic metadata-free PNG derived from the same internal SVG; omission or false preserves the predecessor response exactly. No uploaded markup, image, font or URL is accepted. failed or timed-out admitted attempts are not refunded. Historical mode uses an explicit BCE/CE date object and UT1 conventions. Its response is the versioned historical envelope, not the modern UTC envelope. Read result for calculation fields and metadata for limits and uncertainty.