fix: address 22 project-wide test failures from previous sweep

Three orthogonal issues surfaced by the full project test sweep:

1. Dockerfile.test: install poppler-utils alongside postgresql.
   The 20× `pdfinfo: No such file or directory` failures in
   test_summary_pdf_mapper_chain.py traced to the CI test image
   missing the poppler-utils system package (pdfinfo + pdftotext).
   `_summary_pdf_to_textract_style_pages` shells out to these for
   layout-preserving PDF text extraction. Pure-Python alternatives
   (pymupdf, pypdf) don't reproduce pdftotext -layout's row-major
   table cell ordering, which the Elmhurst Summary extractor depends
   on. So system poppler is the right fix; added to apt-get install
   with an explanatory comment.

2. test_from_rdsap_schema.py::test_total_floor_area: expected 55.0,
   got 45.82. Slice 95 (commit f502db8c) changed the API mapper to
   compute total_floor_area_m2 from the precise sum of per-bp
   sap_floor_dimensions[*].total_floor_area rather than the lodged
   scalar. The synthetic 21_0_1.json fixture has lodged total_floor_
   area=55 + a single fd of 45.82 (per-bp sum doesn't match lodged).
   Updated the expected to 45.82 with a comment explaining the
   Slice 95 per-bp-sum precedence.

3. test_elmhurst_end_to_end.py::test_emitter_temperature: expected
   "Unknown", got int 1. Pre-existing failure (confirmed by checking
   out commit 985a59e1 and reproducing). `_elmhurst_emitter_
   temperature_int` in datatypes/epc/domain/mapper.py converts the
   Elmhurst Summary §14 "Design flow temperature: Unknown" to SAP10.2
   Table 4d code 1 (high-temp / ≥45 °C, worst-case for unmeasured
   boilers). The int encoding mirrors the API mapper's MainHeating
   Detail.emitter_temperature for cross-mapper field parity. Test
   updated to expect 1 (with comment) since the conversion is the
   correct production behaviour.

Verified:
- Layer 4 1e-4 gate (test_api_001479_full_chain_sap_matches_worksheet_
  pdf_exactly) still GREEN.
- Wider domain sweep (domain/sap10_calculator + domain/sap10_ml):
  1654 passed / 20 failed, exact pre-fix baseline.
- All three originally-failing tests now PASS.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Dockerfile.test

@@ -1,8 +1,15 @@
 FROM python:3.11-slim
 
-# Install PostgreSQL binaries — required by pytest-postgresql to spawn ephemeral test databases
+# System binaries:
+#   - postgresql: pytest-postgresql spawns ephemeral test databases
+#   - poppler-utils: provides pdfinfo / pdftotext, used by
+#     backend/documents_parser/tests/test_summary_pdf_mapper_chain.py's
+#     `_summary_pdf_to_textract_style_pages` helper for layout-preserving
+#     PDF text extraction. Pure-Python alternatives (pymupdf, pypdf) don't
+#     reproduce pdftotext -layout's row-major table cell ordering, which
+#     the Elmhurst Summary extractor depends on.
 RUN apt-get update \
-    && apt-get install -y --no-install-recommends postgresql \
+    && apt-get install -y --no-install-recommends postgresql poppler-utils \
     && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app

backend/documents_parser/tests/test_elmhurst_end_to_end.py

@@ -262,9 +262,15 @@ class TestHeating:
         assert result.sap_heating.main_heating_details[0].heat_emitter_type == 1
 
     def test_emitter_temperature(self, result: EpcPropertyData) -> None:
-        assert (
-            result.sap_heating.main_heating_details[0].emitter_temperature == "Unknown"
-        )
+        # The Elmhurst Summary §14 lodges "Design flow temperature: Unknown"
+        # for this cert. `_elmhurst_emitter_temperature_int` (mapper.py)
+        # converts that to SAP10.2 Table 4d code 1 (high-temp / ≥45 °C —
+        # the worst-case assumption for an unmeasured gas boiler). This
+        # int encoding mirrors the API mapper's `MainHeatingDetail.
+        # emitter_temperature` for cross-mapper field parity; the older
+        # behaviour of surfacing the raw "Unknown" string was replaced
+        # when the int conversion landed.
+        assert result.sap_heating.main_heating_details[0].emitter_temperature == 1
 
     def test_fan_flue_present(self, result: EpcPropertyData) -> None:
         assert result.sap_heating.main_heating_details[0].fan_flue_present is True

datatypes/epc/domain/tests/test_from_rdsap_schema.py

@@ -367,7 +367,14 @@ class TestFromRdSapSchema21_0_1:
         assert result.inspection_date == date(2025, 4, 4)
 
     def test_total_floor_area(self, result: EpcPropertyData) -> None:
-        assert result.total_floor_area_m2 == 55.0
+        # Slice 95 (commit f502db8c) changed the API mapper to compute
+        # `total_floor_area_m2` from the precise sum of per-bp
+        # `sap_floor_dimensions[*].total_floor_area` (here: 45.82, a
+        # single ground-floor dimension) rather than the lodged scalar
+        # (here: 55, an integer-rounded display value that doesn't
+        # match the per-bp geometry in this synthetic fixture). The
+        # worksheet uses per-bp sums and the mapper now mirrors that.
+        assert result.total_floor_area_m2 == 45.82
 
     # --- property flags ---