Certify latest US Populace bundle

[MaxGhenis]

Summary

• certifies populace-us-2024-formula-owned-fix-a56aefd-capgains-b2500-20260626T122636Z as the bundled US national Populace dataset
• keeps inherited policyengine-us-data state artifacts via the regional release manifest overlay
• pins US runtime dependencies to policyengine-us==1.745.0 and policyengine-core==3.28.0
• regenerates US/UK TRACE TRO sidecars and updates bundle metadata tests

Verification

• HUGGING_FACE_TOKEN=... HF_TOKEN=... uv run python scripts/bundle.py check --include-tros
• HUGGING_FACE_TOKEN=... HF_TOKEN=... uv run --extra dev python -m pytest tests/test_release_manifests.py tests/test_trace_tro.py tests/test_us_regions.py tests/test_bundle_metadata.py tests/test_certify_data_release.py tests/test_models.py tests/test_manifest_version_mismatch.py (163 passed)
• uv run --extra dev ruff check .
• uv run --extra dev ruff format --check .
• git diff --check
• smoke: imported us_latest, confirmed model 1.745.0, default national URI points to the new Populace H5, and state/ca still resolves to policyengine-us-data 1.115.5