S0380.195: pin sim case 4 (6035 floor geometry) e2e at 1e-4 — 6035 +19 PE is lodged divergence

Adds the user-simulated case-4 worksheet as e2e fixture `001431_6035` —
reproduces golden cert 6035's full floor geometry (Main ground-floor HLP
15.99 + first-floor HLP 8.32, the asymmetric upper storey) and 8 windows.
All 11 Block-1 line refs pin at abs=1e-4 against the worksheet (SAP 68,
ECF 2.2802, cost 937.2341, CO2 4682.3494, space 15745.3260, main fuel
18744.4357).

This is the 4th independent 1e-4 confirmation across the 6035 archetype
(sim cases 1-4). Case 4 matches 6035 on floors + window areas; the
residual ~50 kWh / £11 cascade delta vs 6035 is two lodged inputs only
(largest window orientation N vs S; meter type "Dual" vs API 2), not
calculator behaviour.

Conclusion: the cascade reproduces the spec engine exactly for 6035's
geometry, so 6035's +19 PE vs the lodged register is lodged-register
divergence (the gov.uk register's rounded value vs the spec-exact
worksheet), NOT a calculator gap. 6035 is a "pin-forever" lodged-only
cert. Bugs surfaced + fixed along the way: S0380.192 (Simplified-RR
remaining area) and S0380.193 (suspended-floor sealed rule).

2341 passed (+11), 0 failed; pyright net-zero.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/domain/sap10_calculator/worksheet/_elmhurst_worksheet_001431_6035.py

@@ -0,0 +1,114 @@
+"""Mapper-driven cascade pin against the Elmhurst P960-0001-001431
+"simulated case 4" worksheet — a near-exact replica of golden cert
+6035 (Main + Extension + Simplified room-in-roof, 8 windows).
+
+Like 000565 / sim case 1 / sim case 2, this fixture does NOT hand-build
+the EpcPropertyData: it routes the Summary PDF through
+ElmhurstSiteNotesExtractor + from_elmhurst_site_notes so the SAP-result
+pin grid exercises the WHOLE extractor + mapper + calculator pipeline.
+
+Purpose: prove the calculator is spec-correct for the 6035 archetype
+(after S0380.192 Simplified-RR + S0380.193 suspended-floor fixes). This
+cert reproduces 6035's full floor geometry — Main ground-floor HLP
+15.99 m AND first-floor HLP 8.32 m (the asymmetric upper-storey
+perimeter) — plus 6035's 8 windows (≈14.15 m²). Two minor inputs still
+differ from 6035 (the largest window's orientation is N here vs S in
+6035; meter type "Dual" vs API code 2), accounting for a residual ~50
+kWh / £11 cascade delta — both are lodged inputs, not calculator
+behaviour. All 11 Block-1 line refs pin at abs=1e-4 against this cert's
+OWN worksheet, confirming the cascade reproduces the spec engine exactly
+for 6035's geometry — so 6035's residual +19 PE vs the lodged register
+is lodged-register divergence, not a cascade gap.
+
+Cert shape: Main + Extension 1, both solid brick WITH internal
+insulation (Main) / as-built (Ext1), 3 storeys, Simplified room-in-roof
+on the Main (floor 29.75 m², exposed + party gables), suspended
+uninsulated ground floors (Main ground HLP 15.99 / first 8.32),
+gas-combi SAP code 104, 8 windows, no PV.
+
+Source: user-simulated PDFs at `sap worksheets/golden fixture
+debugging/simulated case 4/`. The Summary is mirrored into the tracked
+`backend/documents_parser/tests/fixtures/Summary_001431_6035.pdf`
+(distinct name — the corpus reuses cert 001431).
+
+Worksheet pin targets (P960-0001-001431, Block 1 — energy rating):
+- SAP rating 68 (line 258), ECF 2.2802 (line 257)
+- Total fuel cost £937.2341 (line 255)
+- CO2 4682.3494 kg/year (line 272)
+- Space heating 15745.3260 kWh/year (Σ monthly (98))
+- Main 1 fuel 18744.4357 kWh/year (line 211)
+- Secondary fuel 0.0 (line 215)
+- Hot water fuel 3307.8383 kWh/year (line 219)
+- Lighting 262.0885 kWh/year (line 232)
+- Pumps/fans 86.0 kWh/year (line 231)
+
+Per [[feedback-zero-error-strict]] + [[feedback-e2e-validation-
+philosophy]]: pins are abs=1e-4 against the worksheet PDF.
+"""
+
+from __future__ import annotations
+
+import re
+import subprocess
+from pathlib import Path
+from typing import Final
+
+from backend.documents_parser.elmhurst_extractor import ElmhurstSiteNotesExtractor
+from datatypes.epc.domain.epc_property_data import EpcPropertyData
+from datatypes.epc.domain.mapper import EpcPropertyDataMapper
+
+
+# parents[0]=worksheet/, [1]=sap10_calculator/, [2]=domain/, [3]=tests/,
+# [4]=repo root.
+_SUMMARY_PDF: Final[Path] = (
+    Path(__file__).resolve().parents[4]
+    / "backend" / "documents_parser" / "tests" / "fixtures"
+    / "Summary_001431_6035.pdf"
+)
+
+
+def _summary_pdf_to_textract_style_pages(pdf_path: Path) -> list[str]:
+    """Convert a Summary PDF into the per-page text format the
+    ElmhurstSiteNotesExtractor expects (label\\nvalue sequences).
+
+    Mirror of the helper in `test_summary_pdf_mapper_chain.py` /
+    `_elmhurst_worksheet_000565.py`.
+    """
+    info = subprocess.run(
+        ["pdfinfo", str(pdf_path)], capture_output=True, text=True, check=True,
+    ).stdout
+    m = re.search(r"Pages:\s+(\d+)", info)
+    if m is None:
+        raise RuntimeError(f"Could not parse page count from {pdf_path}")
+    page_count = int(m.group(1))
+
+    pages: list[str] = []
+    for i in range(1, page_count + 1):
+        layout = subprocess.run(
+            [
+                "pdftotext", "-layout", "-f", str(i), "-l", str(i),
+                str(pdf_path), "-",
+            ],
+            capture_output=True, text=True, check=True,
+        ).stdout
+        tokens: list[str] = []
+        for line in layout.splitlines():
+            if not line.strip():
+                tokens.append("")
+                continue
+            parts = [p for p in re.split(r"\s{2,}", line.strip()) if p]
+            tokens.extend(parts)
+        pages.append("\n".join(tokens))
+    return pages
+
+
+def build_epc() -> EpcPropertyData:
+    """Route the simulated case-2 Summary through extractor + mapper.
+
+    No hand-built EpcPropertyData — the extractor and mapper are part of
+    the test target. Exercises the S0380.192 Simplified-RR fix and the
+    S0380.193 suspended-floor sealed-rule fix.
+    """
+    pages = _summary_pdf_to_textract_style_pages(_SUMMARY_PDF)
+    site_notes = ElmhurstSiteNotesExtractor(pages).extract()
+    return EpcPropertyDataMapper.from_elmhurst_site_notes(site_notes)

tests/domain/sap10_calculator/worksheet/test_e2e_elmhurst_sap_score.py

@@ -40,6 +40,7 @@ from tests.domain.sap10_calculator.worksheet import (
     _elmhurst_worksheet_001431 as _w001431,
     _elmhurst_worksheet_001431_rr as _w001431_rr,
     _elmhurst_worksheet_001431_rr8 as _w001431_rr8,
+    _elmhurst_worksheet_001431_6035 as _w001431_6035,
 )
 from tests.domain.sap10_calculator.worksheet._elmhurst_fixtures import (
     ALL_FIXTURES as _ELMHURST_FIXTURES,
@@ -201,6 +202,21 @@ _FIXTURE_PINS: Final[dict[str, FixtureCascadePins]] = {
         lighting_kwh_per_yr=262.0885,
         pumps_fans_kwh_per_yr=86.0,
     ),
+    # Mapper-driven cohort entry — Summary_001431_6035.pdf → extractor →
+    # mapper → calculator. Reproduces 6035's full floor geometry (Main
+    # ground HLP 15.99 + first 8.32, asymmetric) and 8 windows. Residual
+    # vs 6035 is two lodged inputs only (largest window orientation,
+    # meter type). Pins at 1e-4 → 6035's +19 PE is lodged divergence.
+    "001431_6035": FixtureCascadePins(
+        sap_score=68, sap_score_continuous=68.1906, ecf=2.2802,
+        total_fuel_cost_gbp=937.2341, co2_kg_per_yr=4682.3494,
+        space_heating_kwh_per_yr=15745.3260,
+        main_heating_fuel_kwh_per_yr=18744.4357,
+        secondary_heating_fuel_kwh_per_yr=0.0,
+        hot_water_kwh_per_yr=3307.8383,
+        lighting_kwh_per_yr=262.0885,
+        pumps_fans_kwh_per_yr=86.0,
+    ),
 }
 
 
@@ -215,6 +231,7 @@ _FIXTURE_MODULES: Final[dict[str, ModuleType]] = {
     "001431": _w001431,
     "001431_rr": _w001431_rr,
     "001431_rr8": _w001431_rr8,
+    "001431_6035": _w001431_6035,
 }