FX.53 Student Program: 3-year term, with proof of enrollment to go longer

Owner 2026-11-05: a student license now runs 3 years from issue: a check after year one and after year two, then it stops by itself with no third check. Neither a new check, an old link nor a staff check brings it back; staff extend it a year at a time after seeing proof, with a required note (/admin/student "Extend by a year"). Proof arrives by email to the inbox, so no documents are stored on the site. The installed program keeps working and keeps the versions it covered, as before. Teachers have no term. Licenses issued before this rule keep the old terms (term_ends_at empty). Copy updated on /education, /supercad, the join page, emails, the license certificate and the educator kit; the four kit PDFs were rebuilt.

Not done / untested: the term was tested with a fake clock, and the first real term ends in 2029. A 4-year degree will need the proof step in its last year. The Developer API docs do not mention the term; teachers' systems see the end of a term as student.stale.