The "Phase D.1/D.2/D.3" comment scaffolding and the "Paddle webhook
will fill this in" references became actively misleading after D.3
landed — anyone reading the code would think referral conversion was
still pending. Also corrects a stale "Paddle" reference to "Stripe"
(we never shipped Paddle; ended up on Stripe after the Paddle → Polar
→ Stripe MoR onboarding pivot).
Pure docstring sweep, no behaviour change.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>