Add default rerandomized takeup target handler

[MaxGhenis]

Summary

• add a shared deterministic PolicyEngine-US takeup generation helper used by both the pipeline and target compiler
• make rerandomize_takeup a default fail-closed simulation modifier handler
• keep unsupported existing-only takeup inputs skipped instead of silently compiling stale/missing columns

Validation

• env -u UV_FROZEN uv run --python 3.13 --extra dev --extra policyengine ruff check src/microplex_us/policyengine/takeup.py src/microplex_us/policyengine/us.py src/microplex_us/pipelines/us.py tests/policyengine/test_us.py
• git diff --check
• env -u UV_FROZEN uv run --python 3.13 --extra dev --extra policyengine pytest tests/policyengine/test_us.py tests/test_target_adapters.py -q
• env -u UV_FROZEN uv run --python 3.13 --extra dev --extra policyengine pytest tests/pipelines/test_us.py::TestUSMicroplexPipeline::test_build_policyengine_entity_tables_adds_ecps_stochastic_takeup_inputs tests/pipelines/test_us.py::TestUSMicroplexPipeline::test_attach_policyengine_pregnancy_inputs_assigns_eligible_females tests/pipelines/test_us.py::TestUSMicroplexPipeline::test_attach_policyengine_pregnancy_inputs_preserves_explicit_column tests/pipelines/test_us.py::TestUSMicroplexPipeline::test_build_policyengine_entity_tables_adds_wic_takeup_inputs tests/pipelines/test_us.py::TestUSMicroplexPipeline::test_build_policyengine_entity_tables_preserves_explicit_stochastic_takeup_inputs tests/pipelines/test_us.py::TestUSMicroplexPipeline::test_build_policyengine_entity_tables_uses_eitc_children_for_eitc_takeup -q