feat: add PROPERTY dbt models + fix parse_mixed_date ordering

[benjamin-shi-tql]

Summary

Models the Yardi RAW.PROPERTY object into staging -> intermediate -> marts, following the same conventions as the existing transaction/unit models, and fixes a latent date-parsing bug in the shared parse_mixed_date macro.

New models

• models/staging/stg_yardi__properties.sql (+ yml)
• models/intermediate/int_yardi__property_details.sql (+ yml)
• models/marts/dim_properties.sql (+ yml)

Data-quality remediations (validated against live Snowflake, n=20)

1. Leading-zero ZIP loss: SZIPCODE NUMBER -> LPAD(...,5,'0') (Boston 2101 -> '02101').
2. Magic-number ITYPE -> property_type (Residential/Commercial/Mixed Use).
3. Mixed-format TEXT dates DACQUIRED/DDISPOSED -> DATE via macro (100% parse coverage).
4. BACTIVE/BTAXEXEMPT 0/1 -> boolean.
5. Sensitive owner tax id masked to last 4.
6. Zero-value owner FK HOWNER -> NULLIF(...,0).
7. Region conformance (major): raw SREGION disagrees with property state for 14/20 rows (70%) (e.g. New York NY tagged "Southeast"). Conformed region derived from state; raw kept as region_reported + _int_region_mismatch flag.
8. Unit reconciliation: ITOTALUNITS kept authoritative; actual RAW.UNIT count surfaced as _int_unit_count_mismatch (observability only — UNIT is a partial sample).
9. _int_active_disposed_conflict reconciling BACTIVE vs disposal date.

Macro bug fix (broader impact)

MM/DD/YYYY was tried before MM/DD/YY; Snowflake TRY_TO_DATE greedily accepts a 2-digit year into the 4-digit slot, so 01/21/08 parsed to year 0008. This silently corrupted 426/2000 TRANS.DTEFFECTIVE and 35/240 UNIT.DTLASTINSPECTION rows to years < 1900. Reordering MM/DD/YY first fixes it (2-digit format returns NULL for genuine 4-digit years). Post-fix: 0 parse failures, 0 sub-1900 years across all four TEXT date columns. This also repairs the existing fct_transactions and dim_units models.