Add ACS primary residence value imputation

[daphnehanse11]

Fixes #1079

Summary

• add ACS VALP to raw household columns and expose owner-occupied primary_residence_value in ACS arrays
• include primary_residence_value in ACS-to-CPS and source-imputed QRF housing outputs, zeroing renters/non-owner heads
• update tiny stage fixtures, docs, and regression tests

Tests

• uv run make lint
• uv run pytest tests/unit/datasets/test_acs_tax_unit_construction.py tests/integration/test_cps_generation.py tests/unit/datasets/test_cps_file_handles.py tests/unit/calibration/test_source_impute.py
• uv run pytest tests/integration/test_tiny_stage_1_artifacts.py tests/integration/test_tiny_stage_2_artifacts.py tests/integration/test_tiny_stage_3_artifacts.py tests/integration/test_tiny_stage_4_artifacts.py tests/integration/test_tiny_stage_5_artifacts.py
• uv run --no-sync --with pyyaml python scripts/run_quality_guards.py
• uv run --no-sync --with pyyaml --with pytest pytest tests/unit/test_pipeline_docs_extractor.py tests/unit/test_pipeline_doc_guards.py