Add employment sector (public/private) and SIC industry input variables

changelog.d/1785.md

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+- Add `employment_sector` (public/private) and `sic_industry_division` as Person-level input variables, enabling identification of public-sector workers and industry-level analysis once populated from the FRS.

policyengine_uk/variables/household/income/employment_sector.py

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+from policyengine_uk.model_api import *
+
+
+class EmploymentSector(Enum):
+    NOT_EMPLOYED = "Not in paid employment"
+    PRIVATE = "Private sector"
+    PUBLIC = "Public sector"
+
+
+class employment_sector(Variable):
+    value_type = Enum
+    entity = Person
+    possible_values = EmploymentSector
+    default_value = EmploymentSector.NOT_EMPLOYED
+    label = "Employer sector (public or private) of the person's main job"
+    documentation = (
+        "Whether the person's main job is in the public or private sector. "
+        "Sourced from the FRS `mjobsect` field; NOT_EMPLOYED where the person "
+        "has no main job."
+    )
+    definition_period = YEAR

policyengine_uk/variables/household/income/sic_industry_division.py

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+from policyengine_uk.model_api import *
+
+
+class sic_industry_division(Variable):
+    value_type = int
+    entity = Person
+    label = "Standard Industrial Classification (2007) division of the main job"
+    documentation = (
+        "Two-digit SIC 2007 division of the person's main job (0 if unknown). "
+        "Sourced from the FRS `sic` field. Division 84 = 'Public administration "
+        "and defence; compulsory social security'."
+    )
+    default_value = 0
+    definition_period = YEAR