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_importers.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+from observatory.importers.bubble import import_membership
+from observatory.importers.openrouter import import_usage
+from observatory.importers.stripe import import_payments
+
+IMPORTS = Path(__file__).resolve().parent.parent / "data" / "imports"
+
+
+def test_bubble_import_maps_active_member() -> None:
+    import json
+
+    export = json.loads((IMPORTS / "bubble-export.sample.json").read_text(encoding="utf-8"))
+    payload = import_membership(export)
+
+    assert len(payload["members"]) == 1
+    assert payload["members"][0]["id"] == "member-tegwick"
+    assert payload["members"][0]["status"] == "active"
+    assert payload["members"][0]["source"] == "bubble"
+
+
+def test_stripe_import_normalises_charge() -> None:
+    import json
+
+    export = json.loads((IMPORTS / "stripe-export.sample.json").read_text(encoding="utf-8"))
+    payload = import_payments(export)
+
+    assert payload["records"][0]["gross_amount"] == "8.99"
+    assert payload["records"][0]["net_amount"] == "8.55"
+    assert payload["records"][0]["member_username"] == "tegwick"
+
+
+def test_openrouter_import_converts_cost_to_eur() -> None:
+    import json
+
+    export = json.loads((IMPORTS / "openrouter-export.sample.json").read_text(encoding="utf-8"))
+    payload = import_usage(export, fx_usd_eur="0.92")
+
+    assert payload["records"][0]["cost_eur"] == "0.06"
+    assert payload["records"][0]["member_id"] == "member-tegwick"