Preserve Forbes state geography in local calibration

[MaxGhenis]

Summary

• carry Forbes residence state as a sidecar forbes_state_fips marker on synthetic PUF top-tail rows
• preserve those known states when local calibration assigns block/CD geography
• preserve Forbes source metadata (forbes_name, alias, snapshot date, rank, marital status, children, replicate/unit ids) on the PUF-side household and tax-unit records
• map Forbes age into the filer/head person age for synthetic Forbes households
• add tests for Forbes state markers, source metadata, UTF-8 names, fixed-state geography assignment, and local override extraction

Tests

• uv run ruff check policyengine_us_data/datasets/puf/forbes_backbone.py policyengine_us_data/datasets/puf/disaggregate_puf.py policyengine_us_data/datasets/puf/puf.py policyengine_us_data/calibration/clone_and_assign.py policyengine_us_data/calibration/unified_calibration.py tests/unit/datasets/test_disaggregate_puf.py tests/unit/calibration/test_clone_and_assign.py tests/unit/calibration/test_unified_calibration.py
• uv run ruff format --check policyengine_us_data/datasets/puf/forbes_backbone.py policyengine_us_data/datasets/puf/disaggregate_puf.py policyengine_us_data/datasets/puf/puf.py policyengine_us_data/calibration/clone_and_assign.py policyengine_us_data/calibration/unified_calibration.py tests/unit/datasets/test_disaggregate_puf.py tests/unit/calibration/test_clone_and_assign.py tests/unit/calibration/test_unified_calibration.py
• PYTHONDONTWRITEBYTECODE=1 uv run pytest tests/unit/datasets/test_disaggregate_puf.py tests/unit/calibration/test_clone_and_assign.py tests/unit/calibration/test_unified_calibration.py -q -p no:cacheprovider (112 passed)

Note: full uv run ruff check . still reports pre-existing lint issues in notebooks/scripts outside this patch.