Fix misleading parameter/variable metadata (Tax Credits min_benefit currency, benunit_weekly_hours label) (#1627)

* Fix misleading metadata: tax_credits min_benefit currency, benunit_weekly_hours label

Two unrelated one-line fixes bundled into a single cosmetic PR:

- `gov.dwp.tax_credits.min_benefit` had `unit: currency-USD`; this is a
  UK statutory threshold in pounds, should be `currency-GBP`.
- `benunit_weekly_hours` label says "Average weekly hours worked by
  adults in the benefit unit", but the formula is `adds = ["weekly_hours"]`
  — it's a sum, not an average. Relabels as "Total weekly hours worked
  by adults in the benefit unit".

Both surfaced during a sweep in the #1621 tracking issue.

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

* Relax exact-float YAML assertions in policy tests

---------

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

Author: 3 people

changelog.d/cosmetic-metadata-fixes.fixed.md

@@ -0,0 +1,2 @@
+- Fix `gov.dwp.tax_credits.min_benefit` parameter unit from `currency-USD` to `currency-GBP` — the parameter is a UK statutory threshold in pounds.
+- Correct `benunit_weekly_hours` label from "Average weekly hours worked by adults in the benefit unit" to "Total weekly hours worked by adults in the benefit unit" — the formula is `adds = ["weekly_hours"]`, which sums rather than averages.

policyengine_uk/parameters/gov/dwp/tax_credits/min_benefit.yaml

@@ -7,6 +7,6 @@ metadata:
   reference:
   - href: https://www.legislation.gov.uk/uksi/2002/2008/regulation/9
     name: The Tax Credits (Income Thresholds and Determination of Rates) Regulations 2002
-  unit: currency-USD
+  unit: currency-GBP
 values:
   2002-08-01: 26

policyengine_uk/tests/policy/baseline/finance/benefit/family/universal_credit/childcare_element/uc_childcare_element.yaml

@@ -1,6 +1,6 @@
 - name: No childcare, no element
   period: 2020
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     people:
       parent:
@@ -15,7 +15,7 @@
 
 - name: Childcare for one child under limit
   period: 2020
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     people:
       parent:
@@ -30,7 +30,7 @@
 
 - name: Childcare for one child over limit
   period: 2020
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     people:
       parent:

policyengine_uk/tests/policy/baseline/finance/benefit/family/universal_credit/housing_costs_element/non_dep_deduction/uc_individual_non_dep_deduction.yaml

@@ -1,6 +1,6 @@
 - name: Fully liable
   period: 2020
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     people:
       person:
@@ -15,7 +15,7 @@
 
 - name: Exempt, no deduction
   period: 2020
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     people:
       person:
@@ -30,7 +30,7 @@
 
 - name: Too young, no deduction
   period: 2020
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     people:
       person:

policyengine_uk/tests/policy/baseline/finance/benefit/family/universal_credit/income/uc_income_reduction.yaml

@@ -1,6 +1,6 @@
 - name: Reductions apply at correct rates
   period: 2021
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     uc_earned_income: 10
     uc_unearned_income: 1
@@ -10,7 +10,7 @@
 
 - name: Capped at max amount
   period: 2025
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     uc_earned_income: 1_000
     uc_unearned_income: 400
@@ -20,7 +20,7 @@
 
 - name: Uncapped at max amount
   period: 2025
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     uc_earned_income: 1_000
     uc_unearned_income: 400

policyengine_uk/tests/policy/baseline/finance/income/minimum_wage.yaml

@@ -1,38 +1,38 @@
 - name: Minimum wage for a person over 25
   period: 2021
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     age: 30
   output:
     minimum_wage: 8.91
 
 - name: Minimum wage for a person aged 18 uses the 18 to 20 bracket
   period: 2025
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     age: 18
   output:
     minimum_wage: 10
 
 - name: Minimum wage for a person aged 21 uses the 21 to 22 bracket
   period: 2025
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     age: 21
   output:
     minimum_wage: 12.21
 
 - name: Minimum wage for a person aged 23 uses the 23 to 24 bracket
   period: 2025
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     age: 23
   output:
     minimum_wage: 12.21
 
 - name: Minimum wage for a person aged 25 uses the 25 or over bracket
   period: 2021
-  absolute_error_margin: 0
+  absolute_error_margin: 0.001
   input:
     age: 25
   output:

policyengine_uk/variables/household/income/benunit_weekly_hours.py

@@ -4,7 +4,7 @@
 class benunit_weekly_hours(Variable):
     value_type = float
     entity = BenUnit
-    label = "Average weekly hours worked by adults in the benefit unit"
+    label = "Total weekly hours worked by adults in the benefit unit"
     definition_period = YEAR
     unit = "hour"