docs+deploy: Paddle env, webhook route, collections, CI build args, and spec status

docs/superpowers/specs/README.md

@@ -10,7 +10,7 @@ Build in this order. Specs 0a–5 were designed 2026-07-24; spec 6 on 2026-07-26
 | 2 | [instance-licensing](2026-07-24-instance-licensing-design.md) | [plan](../plans/2026-07-24-instance-licensing.md) | **shipped**, no grandfathering — existing cloud instances are read-only until admin backfills |
 | 3 | [admin-backend](2026-07-24-admin-backend-design.md) | [plan](../plans/2026-07-24-admin-backend.md) | **shipped**, verified end to end against scratch databases |
 | 4 | [admin-site](2026-07-24-admin-site-design.md) | — | ready to start |
-| 5 | [paddle-billing](2026-07-24-paddle-billing-design.md) | [plan](../plans/2026-07-26-paddle-billing.md) | ready to start, **but revised by 7** — its "signup migration off sitesvc" section is superseded by 6, and its single-price-per-subscription assumption by 7 |
+| 5 | [paddle-billing](2026-07-24-paddle-billing-design.md) | [plan](../plans/2026-07-27-paddle-billing.md) | **shipped (code)** — client, webhooks, checkout, entitlement update and portal built and compiled against spec-7's catalogue/entitlements; signup-migration dropped (done by 6). Live sandbox catalog + end-to-end pass is the operator's step. Old [2026-07-26 plan](../plans/2026-07-26-paddle-billing.md) superseded. |
 | 6 | [cloud-instance-creation](2026-07-26-cloud-instance-creation-design.md) | — | ready to start |
 | 7 | [metered-licensing](2026-07-26-metered-licensing-design.md) | [plan](../plans/2026-07-26-metered-licensing.md) | **shipped** — staff can configure and issue any of the six plans; no customer can buy one until 5 lands |