feat(CORE-001D): close remaining boundary cleanup slices

tests/test_event_comparison_ui.py

@@ -1,12 +1,29 @@
 from __future__ import annotations
 
 from datetime import date
+from decimal import Decimal
 
 import pytest
 
 from app.services.event_comparison_ui import EventComparisonFixtureHistoricalPriceSource, EventComparisonPageService
 
 
+def test_event_comparison_page_service_accepts_string_and_decimal_boundary_values() -> None:
+    service = EventComparisonPageService()
+
+    report = service.run_read_only_comparison(
+        preset_slug="gld-jan-2024-selloff",
+        template_slugs=("protective-put-atm-12m", "protective-put-95pct-12m"),
+        underlying_units="1000.0",
+        loan_amount=Decimal("68000.0"),
+        margin_call_ltv="0.75",
+    )
+
+    assert report.scenario.initial_portfolio.underlying_units == 1000.0
+    assert report.scenario.initial_portfolio.loan_amount == 68000.0
+    assert report.scenario.initial_portfolio.margin_call_ltv == 0.75
+
+
 def test_event_comparison_page_service_runs_seeded_gld_preset_deterministically() -> None:
     service = EventComparisonPageService()