Build RowStack Module 3 Demonstrator

Fixed 4-week delivery against three milestones (spec attached) — the 1–3 month setting is Upwork's nearest bracket. Build a working demonstrator of RowStack Module 3 — the Institutional Reporting Layer: a reporting application that ingests property compliance/inventory data and energy/carbon data for a residential property portfolio and renders them as the estates, ESG and Scope 3–style reports a university estates or sustainability team would consume. The demonstrator will be shown live to institutional stakeholders and captured as screenshots in company documentation. It must be honest — real ingestion, real calculation, real rendering — but it is a demonstrator, not a production platform: no authentication, multi-tenancy, or hosting hardening required.