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CKey-Format-v0.19.0.md
v0.1.0-build.85
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| 1 | # CKey Format v0.19.0 — Profile 2 Frame Safety Moat |
| 2 | |
| 3 | Profile 2 retains its 29-unit field, RS(255,210) frame, deterministic visual |
| 4 | fill, and Grid/Ring/Ray calibration keys. Its payload lattice now reserves a |
| 5 | 1.35-unit clear moat around the continuous border. A module that lands in the |
| 6 | frame's raster or blur fringe is not an optical data site. |
| 7 | |
| 8 | The change is geometric and changes the codeword-to-site mapping. Encoders |
| 9 | emit frame format byte `0x13` (decimal 19), profile byte `0x02`. A Profile 2 |
| 10 | reader must use this site's mapping for format 19; earlier format mappings are |
| 11 | historical decode paths only. |