bug: QR Code version 7+ produces unscannable codes (writeVersionInfo bug)

[productdevbook]

Summary

QR Code versions 7 and above produce codes that cannot be scanned. Versions 1-6 work correctly after the RS fix (bda9b20).

Details

Version 7+ requires an 18-bit version information block placed in two locations (bottom-left and top-right). The writeVersionInfo() function in src/encoders/qr/format.ts likely has incorrect bit placement.

Tested with jsQR round-trip:

• V2-V6: OK (scannable)
• V7-V10+: FAIL (unscannable)

The version info encoding or placement needs to be verified against ISO/IEC 18004 Table C.1.

Reproduction

import { encodeQR } from 'etiket';
const matrix = encodeQR('test', { version: 7 }); // produces unscannable code

References

• ISO/IEC 18004 Section 7.10 (Version information)

[productdevbook]

Fixed in commit a0867b3 / e4631a5 / b4e8107