Get customer counts for NY utilities, central utility crosswalk, and tariff mapper fixes

[jpvelez]

What

Get customer counts for NY electric utilities (EIA-861), add a central utility crosswalk, fix tariff mappers to use real assign_utility data, and standardize on std_name throughout. Expanded scope from original: beyond the reweighting CSV, this establishes a single source of truth for utility identifiers across EIA-861, NY Open Data polygons, assign_utility_ny, tariff mappers, and eia_region_config.

Why

We need to reweight the ResStock customer counts for each utility we model for internally consistent results. Additionally, utility names from EIA-861, NY Open Data, and tariff mappers were fragmented—no single mapping. Tariff mappers were using synthetic data instead of real assign_utility_ny output.

How

• Central crosswalk: utils/utility_codes.py with one record per utility (std_name, ny_open_data_state_names, eia_utility_ids, gas_tariff_key, etc.). All lookup tables derived from this.
• Refactor assign_utility_ny to use get_ny_open_data_to_std_name() from utility_codes
• Add utility_code column to get_utility_stats_from_eia861 output (EIA ID → std_name mapping)
• Fix electric_tariff_mapper: use real sb.electric_utility when present, support metadata_utility path, accept std_name (coned, nyseg, nimo)
• Fix gas_tariff_mapper: use crosswalk for gas_tariff_key (nimo/keddy/kedli→national_grid), same metadata and std_name fixes
• Update utils/types.py: electric_utility and gas_utility Literals use std_name
• Update Justfiles (NY, RI) to use std_name in map-electric-tariff and map-gas-tariff recipes
• Use that script to get customer counts for NY IOUs, save to ny/hp_rates/data/ny_electric_utility_stats.csv (includes utility_code)
• Add a task to the Justfile in ny/hp_rates/resstock that calls the reweighting script on every utility in NY using the customer counts from the previous step (future work)

Deliverables

• utils/utility_codes.py — central crosswalk
• utils/get_utility_stats_from_eia861.py — outputs utility_code column
• Tariff mappers use real data when available; synthetic fallback deprecated
• ny_electric_utility_stats.csv with utility_code for NY IOUs
• Tests for utility_codes, tariff mappers, assign_utility refactor

[linear]

RDP-44