Use national Populace scoping for place repro code

[MaxGhenis]

Summary

• extend the default Populace region-scoping path to US place/ regions
• stop default place reproduction code from synthesizing parent state H5 URLs like policyengine-us-data/states/NJ.h5
• keep explicit historical pinned place dataset URLs reproducible for old reports

This complements PolicyEngine/populace#237, which removes state and congressional-district H5 artifacts from US releases so consumers rely on the single national Populace file plus region scoping.

Verification

• bun run vitest src/tests/unit/utils/reproducibilityCode.test.ts
• bunx prettier --check app/src/utils/reproducibilityCode.ts app/src/tests/unit/utils/reproducibilityCode.test.ts
• bun run eslint src/utils/reproducibilityCode.ts src/tests/unit/utils/reproducibilityCode.test.ts

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Project	Deployment	Actions	Updated (UTC)
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policyengine-calculator-next	Ready	Preview, Comment	Jul 1, 2026 1:37pm
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[MaxGhenis]

Cycle review found a blocker: default US place regions cannot be safely moved to national Populace scoping yet because the current Populace H5 has state_fips and congressional_district_geoid, but no place_fips, and policyengine.py place regions currently have no scoping_strategy. I pushed a revert of this PR's place change. App-v2 main already handles default state and congressional-district regions through Populace region scoping from #1077; this PR should not be merged unless/until Populace emits place_fips and policyengine.py adds place scoping.

[MaxGhenis]

Closing after cycle review: the only remaining change attempted to move default place regions to national Populace scoping, but the current Populace H5 does not include place_fips and policyengine.py place regions have no scoping strategy yet. State and congressional-district default repro paths are already handled on main by #1077.