Correct Texas CCS expanded-age rates and pay relative and blended care from January 2025

changelog.d/tx-ccs-expanded-rates.fixed.md

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+Correct 128 Texas Child Care Services expanded-age rate cells to the Texas Workforce Commission's published tables. Pay relative care and blended schedules from January to September 2025, and pay relative care entered with either the Reg or None rating.

policyengine_us/parameters/gov/states/tx/twc/ccs/payment/rates_expanded_age_groups/__init__.py

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 # Sources:
 # BCY25: https://www.twc.texas.gov/sites/default/files/ccel/docs/bcy25-board-max-provider-payment-rates-8-age-groups-twc.pdf
 # BCY26: https://www.twc.texas.gov/sites/default/files/ccel/docs/bcy26-board-max-provider-payment-rates-twc.pdf
+#
+# TWC's BCY25 table prints full-time and part-time rates for LCCC, LCCH and RCCH.
+# bcy2025.csv holds those cells as printed and adds two sets, which gives January
+# to September 2025 the same cells as BCY26:
+# - RELATIVE rows hold each Board's relative rates from TWC's four-age BCY25 table:
+#   https://www.twc.texas.gov/sites/default/files/ccel/docs/bcy25-board-max-provider-payment-rates-4-age-groups-twc.pdf
+#   Infant covers 0-17 months, Toddler 18 months to 2 years, Preschool 3-5 years,
+#   and School Age 6-13 years. 40 TAC 809.20(a)(1)(D) has Boards set relative rates,
+#   and WD Letter 19-24, Change 1, leaves them to Boards and ends the four-age rates
+#   on January 12, 2025:
+#   https://www.twc.texas.gov/sites/default/files/wf/policy-letter/wd/19-24-ch1-twc.pdf#page=3
+#   TWC's BCY26 table prints the same relative rates in 447 of 448 cells.
+# - The *_bt columns hold TWC's blended rate, (175 x part-time + 30 x full-time) / 205,
+#   rounded half up to the cent, for the ages BCY26 prints:
+#   https://www.twc.texas.gov/sites/default/files/wf/policy-letter/wd/02-20-twc.pdf#page=2
 
 import pandas as pd
 from functools import lru_cache