feat(PORT-004C): seed workspace routes from portfolio settings

tests/test_event_comparison_ui.py

@@ -66,6 +66,25 @@ def test_event_comparison_page_service_exposes_seeded_preset_options() -> None:
     )
 
 
+def test_event_comparison_page_service_keeps_fixture_window_while_using_caller_portfolio_inputs() -> None:
+    service = EventComparisonPageService()
+
+    report = service.run_read_only_comparison(
+        preset_slug="gld-jan-2024-selloff",
+        template_slugs=("protective-put-atm-12m",),
+        underlying_units=9680.0,
+        loan_amount=222000.0,
+        margin_call_ltv=0.80,
+    )
+
+    assert report.scenario.start_date.isoformat() == "2024-01-02"
+    assert report.scenario.end_date.isoformat() == "2024-01-08"
+    assert report.scenario.initial_portfolio.entry_spot == 100.0
+    assert report.scenario.initial_portfolio.underlying_units == 9680.0
+    assert report.scenario.initial_portfolio.loan_amount == 222000.0
+    assert report.scenario.initial_portfolio.margin_call_ltv == 0.80
+
+
 def test_event_comparison_page_service_resets_template_selection_to_preset_defaults() -> None:
     service = EventComparisonPageService()