Add data-kb-placeholder qr/barcode support with rqrcode and barby.
Scale QR to fit placeholder box (viewBox + meet) and barcode by height
with natural width. Declare barby and rqrcode runtime dependencies.
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Synchronize CMake, README, and Ruby gem version strings with the released v1.0.1 tag to keep build and packaging metadata consistent.
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Align raster protocol bytes and print-end sequencing by printer family, add safer status polling/retry behavior, and document the changes with regression coverage to prevent protocol regressions.
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Capture design notes for merge-print and PNG fit behavior, clean up Ruby README formatting, and include a new sample PNG for print testing.
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Align print command payload generation with model-specific protocol requirements, add verbose CLI diagnostics and robust status retries, and introduce protocol regression tests to prevent future GF/ESC i z regressions.
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