AsciiMath / LaTeX / MathML Equation Converter Field Guide: When Three Equation Dialects, Five Output Layers, and One Auto-Detect Pass Decide Whether Your Math Markup Ships as One Canonical String or Three Fragments

Three equation dialects, one canonical string: auto-detect AsciiMath, LaTeX, or MathML input and emit canonical LaTeX plus presentation MathML with an embedded TeX annotation, an aria-label snippet, and a server-side KaTeX preview.