Reusable signing flow: service handler generates document → inserts
esign_records row → emails JWT link → client reviews PDF + signs →
API stores signature + resumes pipeline. Works for RMD, CPNI, CALEA,
499-A engagement, discontinuance, CRTC, and any future doc types.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
