Implement ADAPTIVE-WP-0002 Sprint 1 economic foundations

Add Coulomb observatory package with JSON registries (product, pricing
models, costs, revenue, membership), economics snapshot engine, Economics
Dashboard v1 CLI, sample report, and pytest coverage. Complete T01 and
queue Sprint 2 Bubble.io integration.

projects/coulomb-pricing/data/revenue.json

@@ -0,0 +1,16 @@
+{
+  "version": 1,
+  "entries": [
+    {
+      "id": "rev-2026-06-estimate",
+      "period": "2026-06",
+      "gross_amount": "80.91",
+      "fees_amount": "2.46",
+      "refunds_amount": "0.00",
+      "net_amount": "78.45",
+      "currency": "EUR",
+      "source": "manual_estimate",
+      "note": "Seed estimate for Sprint 1; replaced by Stripe sync in Sprint 3"
+    }
+  ]
+}