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/tests/test_api.py

@@ -21,6 +21,10 @@ def test_dashboard_payload_contains_live_ledger_totals() -> None:
     assert payload["cost_floor"]["active_price"] == "8.99"
     assert len(payload["value_range"]["segments"]) == 2
     assert payload["market_price"]["alternative_count"] == 4
+    assert payload["membership_analytics"]["active_members"] == 1
+    assert payload["usage"]["record_count"] == 1
+    assert len(payload["pricing_simulations"]["scenarios"]) == 3
+    assert payload["recommendations"]
 
 
 def test_payload_json_is_valid() -> None: