Certified critical-line bound 0.673638842664358872953956820071

Derived from Rishi Khan's TEN certificate and Zeta23; retains all original notices and prior attribution. Strengthens root_cover using all nonnegative linear terms after the small-gap exclusion, re-certifies the raised target, and refines three cleared cover intervals while preserving SMAX and root geometry. This exact 1,975,352-byte source restores the historical ordinary-build skipKernelTC option; independent verification is retained. In a pinned GitHub Linux VM, the unchanged official non-E2B wrapper and full Comparator/nanoda/Lean replay passed in 2798.774s under an 8GiB/no-swap limit with 2 CPUs; all three targets use only the standard three axioms. Official E2B acceptance is requested.