docs(web): reframe the name around trust-based printed rice notes (no debt)

docs/what-is-tane.md

@@ -56,19 +56,16 @@ put away. For all ages, from 10 to 80.
 ## A Japanese name
 
 **Tane** means "seed" (種); *tanemaki* (種まき) means "to sow seeds". And it's no accident
-that the name is Japanese. In early Japan (8th–10th centuries) there was the *suiko* (出挙):
-rice from the granaries was lent out as seed in spring and returned in autumn, after the
-harvest. It began as relief — giving grain to those who had none to sow — but it was repaid
-with interest (from half as much again up to double the loan), and over time it hardened
-into an obligation that left peasants in debt harvest after harvest. The same sack of rice
-was at once seed, food and debt.
+that the name is Japanese. Centuries ago in Japan, printed slips of paper that promised
+rice passed from hand to hand: they were issued by temples, merchants and rice warehouses —
+not by a bank or a central authority — and people accepted them on trust in that promise.
+An exchange network with no centre, held together by trust, where a scrap of paper was
+enough to set rice in motion.
 
-Tane keeps that age-old gesture — lending seed and giving it back after the harvest — but
-takes out the trap. When you share seeds you can attach a **Plantare**: a promise to
-return, when you can, a similar amount of free seed. It is not a debt and carries no
-interest: it is a pledge to keep the seed alive and moving. And because returning it means
-growing it, and growing multiplies it, every loan makes the commons grow instead of
-shrinking it.
+Tane inherits that spirit. When you share seeds you can attach a **Plantare**: a promise to
+return, when you can, a similar amount of free seed. It isn't a purchase or an obligation —
+it's a commitment to keep the seed alive and moving. And because returning it means growing
+it, and growing multiplies it, every gesture makes the commons grow instead of shrinking it.
 
 ## Where it stands and how to help