Fix YAML structure

Author: vahid-ahmadi

policyengine_uk/parameters/gov/hmrc/childcare_subsidies/tax_free_childcare/age_limits.yaml

@@ -1,8 +1,9 @@
 description: Age thresholds for tax-free childcare eligibility, including standard and disability-related limits.
 values:
   2025-01-01:
-    standard_age_limit: 12
-    disability_age_limit: 17
+    value:
+      standard_age_limit: 12
+      disability_age_limit: 17
     metadata:
       reference:
         - title: Tax-Free Childcare Guidance
@@ -13,4 +14,4 @@ metadata:
   label: Age limits for tax-free childcare eligibility
   reference:
     - title: Childcare Act
-      href: https://www.legislation.gov.uk/ukdsi/2015/9780111127063
+      href: https://www.legislation.gov.uk/ukdsi/2015/9780111127063

policyengine_uk/parameters/gov/hmrc/childcare_subsidies/tax_free_childcare/contribution_parameters.yaml

@@ -1,12 +1,13 @@
-description: Parameters for tax-free childcare government contribution calculations
+description: Parameters for tax-free childcare government contribution calculations.
 values:
   2025-01-01:
-    contribution_rates:
-      standard_child:
-        yearly_max: 2000
-      disabled_child:
-        yearly_max: 4000
-      government_contribution_ratio: 0.25  # 2/8 expressed as decimal
+    value:
+      contribution_rates:
+        standard_child:
+          yearly_max: 2000
+        disabled_child:
+          yearly_max: 4000
+        government_contribution_ratio: 0.25  # 2/8 expressed as decimal
     metadata:
       reference:
         - title: Tax-Free Childcare Guidance
@@ -16,5 +17,5 @@ metadata:
   name: contribution_parameters
   label: Tax-free childcare contribution parameters
   reference:
-    - title: Childcare Payments Act 2014
-      href: https://www.legislation.gov.uk/ukdsi/2015/9780111127063
+    - title: Childcare Payments Act
+      href: https://www.legislation.gov.uk/ukdsi/2015/9780111127063

policyengine_uk/parameters/gov/hmrc/childcare_subsidies/tax_free_childcare/income_thresholds.yaml

@@ -1,15 +1,16 @@
-description: Income thresholds for tax-free childcare eligibility by age group
+description: Income thresholds for tax-free childcare eligibility by age group.
 values:
   2025-01-01:
-    adult:
-      min_age: 21
-      quarterly_income: 2379
-    young_adult:
-      min_age: 18
-      max_age: 20
-      quarterly_income: 1788
-    youth:
-      quarterly_income: 1331
+    value:
+      adult:
+        min_age: 21
+        quarterly_income: 2379
+      young_adult:
+        min_age: 18
+        max_age: 20
+        quarterly_income: 1788
+      youth:
+        quarterly_income: 1331
     metadata:
       reference:
         - title: Tax-Free Childcare Guidance
@@ -20,4 +21,4 @@ metadata:
   label: Income thresholds for tax-free childcare eligibility
   reference:
     - title: Childcare Payments Act 2014
-      href: https://www.legislation.gov.uk/ukdsi/2015/9780111127063
+      href: https://www.legislation.gov.uk/ukdsi/2015/9780111127063