Remove SSTB/QBI compat shim, require policyengine-us 1.637.0 (#770)

* Remove SSTB/QBI compat shim now that us 1.637.0 ships natively

policyengine-us 1.637.0 adds `sstb_self_employment_income`,
`sstb_w2_wages_from_qualified_business`,
`sstb_unadjusted_basis_qualified_property`,
`sstb_self_employment_income_would_be_qualified`,
`sstb_qualified_business_income`, `total_self_employment_income`, and
the SSTB-aware QBI formulas as first-class variables (PR #7944). The
data package no longer needs to backfill them.

Bump the `policyengine-us` floor to `>=1.637.0`, delete the
`ensure_policyengine_us_compat_variables` monkey-patch and its three
call sites, and drop the compat-specific unit tests that validated the
shim's SSTB variable registration and QBID arithmetic — those
behaviors are now covered by policyengine-us's own test suite.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Lock policyengine-us 1.637.0

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Rename changelog fragment to PR number

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: MaxGhenis

changelog.d/770.changed.md

@@ -0,0 +1,3 @@
+Require `policyengine-us>=1.637.0`, which ships the SSTB QBI split inputs
+and formulas natively, and remove the in-package compat shim that
+backfilled those variables against older `policyengine-us` releases.

policyengine_us_data/__init__.py

@@ -1,9 +1,6 @@
 from importlib import import_module
 
 from .geography import ZIP_CODE_DATASET
-from .utils.policyengine import ensure_policyengine_us_compat_variables
-
-ensure_policyengine_us_compat_variables()
 
 _LAZY_EXPORTS = {
     "CPS_2024": (

policyengine_us_data/db/validate_database.py

@@ -11,10 +11,6 @@
 
 import pandas as pd
 
-from policyengine_us_data.utils.policyengine import (
-    ensure_policyengine_us_compat_variables,
-)
-
 
 DEFAULT_DB_PATH = (
     Path("policyengine_us_data") / "storage" / "calibration" / "policy_data.db"
@@ -30,8 +26,6 @@
 
 
 def validate_database(db_path: str | Path = DEFAULT_DB_PATH) -> None:
-    ensure_policyengine_us_compat_variables()
-
     from policyengine_us.system import system
 
     conn = sqlite3.connect(str(db_path))