Complete Economic Observatory MVP (ADAPTIVE-WP-0002)

Add file-based Bubble, Stripe, and OpenRouter importers; usage attribution,
cost allocation, pricing simulator, credit wallets, and recommendations in the
dashboard API. Document whynot-design UI workflow and archive the finished
workplan with all ten tasks marked done.

projects/coulomb-pricing/data/imports/stripe-export.sample.json

@@ -0,0 +1,15 @@
+{
+  "charges": [
+    {
+      "id": "pay-2026-06",
+      "period": "2026-06",
+      "gross": "8.99",
+      "fee": "0.44",
+      "net": "8.55",
+      "currency": "EUR",
+      "customer": "tegwick",
+      "product": "coulomb.social-membership",
+      "payout_account": "binky-hedgehog"
+    }
+  ]
+}