Candidate: populace-us as the certified US data release

[MaxGhenis]

Stages the eCPS-free populace-us release (populace-us-2024-9f1260b-20260611) as the US data release for the next bundle cut.

• Release manifest (usdata schema v1) lives at the immutable tag: hf://dataset/policyengine/populace-us@populace-us-2024-9f1260b-20260611/releases/populace-us-2024-9f1260b-20260611/release_manifest.json — data_package populace-data 0.1.0, default dataset populace_us_2024, microdata sha256 dc75c0d4…, plus auxiliary build manifest and the full sound-comparison JSON as pinned artifacts (mp-ecps precedent).
• Generated and validated locally with this repo's tooling: generate_bundle.py produced the country assertion (4 artifacts, default dataset resolved) and validate_bundle.py exited 0 (directory contract + all package pins passed).
• bundle_version is set to 4.15.0 for schema validity; the published bundles/4.15.0 is immutable, so this candidate takes effect at the next bundle cut (bump the version field then).
• Compatibility asserted for policyengine-us ==1.722.4/==1.722.5/==1.723.0 and core ==3.27.0 (the versions the artifact was load-verified, built, and gated under respectively).
• Validation behind the release: parity 0 gaps, all stored columns nonzero, calibration 95.09% within 10%, score at matched 41,314 households — train 0.190 vs 1.089, holdout 0.038 vs 0.317, full 0.228 vs 1.406. Proposal context: proposals/populace-us-2024-9f1260b-20260611.json (merged).

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