Revert US certified dataset to Enhanced CPS

[MaxGhenis]

Fixes #391

Summary

Reverts the certified US dataset back to production Enhanced CPS. v4.14.1 (#390) promoted the microplex MP 2cdd45d artifact to the certified US default, but on a correctly-scored target surface eCPS decisively beats MP — and MP is materially worse on the income components that drive a tax model.

metric (lower is better)	eCPS	MP 2cdd45d
full PE-native loss	0.02662	0.04275
holdout loss	0.00769	0.00938
unweighted MSRE	0.174	0.290
target wins (of 2809)	2334	267 (208 ties)

MP is 14–49× worse on interest, retirement, dividends, capital gains, wages, and self-employment, and only better on SNAP. Verified by two independent symmetric-refit comparisons agreeing to the digit. The promotion cleared a content baseline gate; the numeric baseline-sanity gate would have failed it because eCPS was mis-scored at MSRE 3.464 on the promotion surface (e.g. unemployment +615%).

Change

Produced with the supported refresh path, not by hand-editing the manifest:

scripts/refresh_release_bundle.py --country us --model-version 1.715.2 \
  --data-version 1.115.5 --release-manifest-path release_manifest.json \
  --release-manifest-revision d47fb5475144260a75467d2f2e22b2d5d53d4d57

Restores:

• release_manifests/us.json + us.trace.tro.jsonld → enhanced_cps_2024 (policyengine-us-data 1.115.5, rev d47fb547, dataset sha 0a6b961a), model 1.715.2, legacy_compatible_model_package
• pyproject.toml policyengine-us pins → 1.715.2
• tests/test_models.py + tests/test_release_manifests.py → reverts Update US release manifest to MP eCPS artifact #390's MP expectations
• uv.lock

us.json is byte-identical to the pre-#390 eCPS manifest except the policyengine_version/bundle_id stamp, which CI restamps on release.

Testing

• test_release_manifests, test_trace_tro, test_bundle_refresh, test_import_policyengine_bundle: 98 passed
• test_models: 35 passed
• test_household_calculator_snapshot: 10 passed — no drift from the 1.715.3→1.715.2 model revert
• make format / make lint: clean

MP remains a research track, to be re-promoted only once it wins on a correctly-scored surface (after the CPS-passthrough income-component fix). HF revision a091769a is left in place; nothing points at it once this merges.

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