Drop the runtime qrcode + @types/qrcode packages in favor of a zero-dependency
byte-mode QR encoder (versions 1-40, EC L/M/Q/H, auto version + mask selection)
with a half-block ANSI renderer. Cross-validated byte-for-byte against the qrcode
reference library and decoded end-to-end with jsQR. Adds encoder regression tests.
can1357