Build a scanner compatibility matrix

[Jayktopus]

Goal

Collect comparable results from different flatbed scanners and drivers.

Suggested fields

Scanner model, operating system, driver, scan application, DPI, image format, calibration method, runtime, result quality and known artefacts.

Acceptance criteria

• Add a documented table or structured data format under docs/.
• Include the existing HP DeskJet 2540 baseline.
• Include clear instructions for contributing a result.
• Keep real scans opt-in and document their licence and privacy status.