The docs stage now refuses secret-shaped content (key names, PEM private
keys, JWTs) in each sibling's testdata/goldens; --self-test plants each
pattern. Closes T-19.1-12.
Copy the phase 19 detector shape onto five sibling plugin roots, named short tests, postgres tracers plus GDPR names, and the three decision-note greps.
Co-authored-by: Cursor <cursoragent@cursor.com>