Standalone blog-style page (matching chunkfive/monospace b&w UX) explaining the
whole solution: amplitude-as-data, the no-copy-paste signaling relay, the
multi-level modem, the Opus->G.711 codec fix and 440 Hz beat, the ACK/outbox
reliability layer, and the Hamming(12,8)+Gray FEC. Linked from chat.html's
header.
