AI stylometric tells

The identifiable stylistic fingerprints of machine-written text (em-dash overuse, the 'not X, but Y' antithesis closer, uniform cadence) that mark authorship as AI and can be detected or deliberately scrubbed to humanize output.

grounded in: commits 47bc298 'linkedin: ban em-dashes entirely (prompt + mechanical strip)' and ecc99cf 'ban the it isn't A, it's B antithesis closer (top AI tell) in de-slop pass'; li_publish.py de-slop pass