Drop raw-source and build-intermediate columns from the published populace-us artifact

Summary

The published populace-us artifact should store PolicyEngine-recognized inputs plus explicit structural/geo columns, not raw source-survey fields or build scratch columns.

Drop (raw source + build intermediates)

• Raw CPS ASEC columns: A_AGE, A_FTPT, WSAL_VAL, SEMP_VAL, WC_VAL, DIS_VAL1, etc.
• Raw SCF columns such as scf_net_worth, scf_bank_account_assets, and other scf_* source fields once the PE inputs they feed are set.
• Build scratch: _half, _orig_household_id, *_is_puf_clone, new_tax_unit_id, and redundant intermediate weights if they duplicate calibrated weights.

Keep

• Geo identifiers used by the local-area pipeline: block_geoid, tract_geoid, congressional_district_geoid, cbsa, etc.
• Structural keys and calibrated weights.

Acceptance criteria

• The export surface has an explicit structural/geo allow-list.
• Raw source and scratch columns are removed upstream before final artifact writing.
• A gate fails when an artifact contains columns outside PE variables plus the allow-list.
• Tests cover a raw-source column, a scratch column, and a retained geo/structural column.

Locate the populace-us export and the upstream final-artifact writing path, then trace where raw CPS/SCF fields and build scratch columns enter the pipeline. Add the explicit structural/geo allow-list and artifact gate, and run the relevant export tests to verify raw-source and scratch columns are rejected while a retained geo or structural column remains.