Record actual Stripe payment costs for tegwick membership

Update payment_records to 8.99 EUR gross, 0.44 EUR fees, 8.55 EUR net
payout to binky-hedgehog. Link member tegwick in membership ledger and
add Stripe reference catalog.

projects/coulomb-pricing/README.md

@@ -24,7 +24,8 @@ computes all totals programmatically (`ledger.py` → `economics.py`).
 
 **Current reality:** infrastructure from January 2025 — domains **€6.75/mo**,
 coulombcore hosting **€13.99/mo** (from Jan 2025), railiance01 hosting
-**€8.99/mo** (from Mar 2026). Sole member payments from November 2025. Customer
+**€8.99/mo** (from Mar 2026). Member **tegwick** pays **€8.99/mo** (Stripe fee
+**€0.44**, net payout **€8.55** to binky-hedgehog) from November 2025. Customer
 cost-pass-through billing is not active.
 
 ### Commands