Merge branch 'codex/fix-1463' of https://github.com/PolicyEngine/policyengine-uk into codex/merge-1549

Author: MaxGhenis

policyengine_uk/parameters/gov/contrib/behavioral_responses/employee_salary_sacrifice_reduction_rate.yaml

@@ -5,7 +5,7 @@
 # Most employees would optimize their salary sacrifice to avoid NI charges by reducing it to the cap level.
 description: The percentage by which employees reduce their salary sacrifice pension contributions in response to the salary sacrifice pension cap.
 values:
-  2010-01-01: 0  # Default: full optimization (employees reduce to cap level)
+  2010-01-01: 0  # Default: no adjustment (employees keep high salary sacrifice)
 metadata:
   unit: /1
   label: Employee salary sacrifice reduction rate in response to cap