C671: forty-step checkpoint

File70’s repetitions now reduce to translated rails, reflections and indexed paths. Jacob’s death-centered7|70|70|7 reflection differs from his biographical70|7|70 symmetry. The cumulative4900 body is x(k)=5436−70k; its supplied cuts49,50,57,69 produce the named subdivisions. The larger13475 path is175×(49+20+8).

Supplement A’s generator is especially compact: f=30,c=23f. Its native carrier is24f, its two-flank bracket25f, and E(c)=25f. Retaining flanks during core conversion produces the full native/P/E table. The native six-node cell is2c+3f=49f=1470; its several partitions are consequences of the same construction.

Phase precision: C662 changes only the Jacob junction with outer5436/536 fixed. C664 uses the whole-year2083/1936/1446 display throughout. Exact phase coordinates must be compared in corresponding phases.

Next: reconstruct the complete phase table, the conserved-center closures and the micro/macro calibration bridge.