Housing Distress Index (HDI) methodology paper v1 -- data deposit

Frozen data artifacts for the Lunous Housing Distress Index (HDI) methodology paper. These are the exact bytes the paper's analysis read -- primary artifacts, never regenerated. Contains county-level HDI v2 scores (2010-2024, 3,144 counties), national scores, and CoC-level PIT panel data. All files SHA-256 verified. See README.md for full documentation and hash table. Version 1.2 accompanies the paper's version 1.1 erratum: corrected documentation and the files behind the erratum's county tables. The three original parquet files are unchanged.