Actual J2 Seam Coordinates
Abstract
Exact generator-coordinate calculations locate every literal c edge of the five J2 words in the independent T/E seam inventory. They also establish the actual initial seeds, short-row starts and final-row starts. These private consumed proofs do not assume endpoints or seam occurrence.
The private proof declarations in this module are consumed by the actual surviving-word component construction. No separate specialization or unproved endpoint interface is exported.