One-time ingest of Wythenshawe Community Housing Group Elmhurst *Summary*
PDFs: resolve each property's SharePoint folder from the WCHG xlsx, download
the summary, run the existing extractor -> mapper -> SAP10 pipeline, and
(with --commit) push the PDF to S3, record an uploaded_files row, and save
the EpcPropertyData to epc_property keyed on the national UPRN (property_id
NULL, replace-by-(uprn,source)). Dry-run by default; also emits a SAP-accuracy
CSV vs Elmhurst's reported current SAP (% within 0.5 + MAE).
Adds DomnaSites.SOCIAL_HOUSING (SOCIAL_HOUSING_SHAREPOINT_ID) for the site.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
