C248 — P6 gains a sourced 6875 close endpoint without repairing its 6877 gap

23 September 2026 · Step 43 of 60, continuing C205.

P6 uses native Creation 4417t/4416n BC and Conquest mirror AD 1403t/1404n. Its twice-expanded 11-fold endpoint is AD 2459t/2460n, the ordinary MT G3 Flood close.

The original exact 13-fold requirement at this Creation member is AD 2461t/2462n, still absent. G3 Flood start at 2460 remains between the new 2459 close and the missing 2461 requirement. Thus the new endpoint supports a distinct 6875 interval; it does not repair the prior 6877 source failure, invent G4 or merge start and close states.

Evidence and scope

K=529 and r=25/23. BC base B means (B+1)t/Bn BC; reflected AD base A means AD At/(A+1)n. Their civil span is B+A in both seasonal components, with no year zero. Signed paired centers are −B and +A; the center model uses components ±1/4 and restores this separation after dilation. An interval center is geometry, not an event or a proposed universal Mirror axis.

Regular Gears are restricted to Noah/Shem/Flood. Creation and Conquest retain fixed source-field members; no fourth Gear is admitted. Generated coordinates, source-field membership and stored graph incidence are distinct. File_18/File_09 and the frozen C127 graph are unchanged. Earlier N01/N03 qualifications, the missing Shem join, closed primers and unestablished original Reports 11–25 remain unchanged. This packet selectively uses prior evidence; it does not rerun completed campaigns. Assertions and alternative placements are not independent historical witness counts.

5 step-specific checks and 19 frozen-input checks passed. Exact inputs, results and predecessor hashes are in the accompanying JSON records; calculation code is in the evidence archive. Source dependencies are identified in the body and frozen in sources/.