Bootstrap fin-hub scaffold from hub-core (CUST-WP-0025-T22/T23)

Add hub-core editable dependency, fin-specific SQLAlchemy models, and smoke tests.

tests/test_models.py

@@ -0,0 +1,21 @@
+"""Smoke tests for fin-hub model registration."""
+
+from fin_hub.models import Budget, BurnRate, Commitment, RunwayProjection, TokenSpend
+from hub_core.models.base import Base
+
+
+def test_fin_models_register_on_metadata():
+    tables = {table.name for table in Base.metadata.sorted_tables}
+    assert "fin_budgets" in tables
+    assert "fin_commitments" in tables
+    assert "fin_burn_rates" in tables
+    assert "fin_runway_projections" in tables
+    assert "fin_token_spends" in tables
+
+
+def test_model_classes_importable():
+    assert Budget.__tablename__ == "fin_budgets"
+    assert Commitment.__tablename__ == "fin_commitments"
+    assert BurnRate.__tablename__ == "fin_burn_rates"
+    assert RunwayProjection.__tablename__ == "fin_runway_projections"
+    assert TokenSpend.__tablename__ == "fin_token_spends"