feat(dbt): dim_school.inspectorate and ofsted_listed (H4)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

pipeline/transform/models/intermediate/int_ofsted_listed.sql

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+-- Intermediate model: every URN Ofsted's own data lists, inspected or not
+-- (audit H4). Only these may be called "Not yet inspected". Reads the raw
+-- school MI because stg_ofsted_inspections drops rows with no inspection date.
+
+with school_mi as (
+    select distinct cast(urn as integer) as urn
+    from {{ source('raw', 'ofsted_inspections') }}
+    where urn is not null
+),
+
+fe as (
+    select distinct g.urn
+    from {{ ref('stg_gias_ukprn') }} g
+    join {{ ref('stg_ofsted_fe_providers') }} p
+      on p.provider_urn = g.urn
+      or (g.ukprn is not null and p.provider_ukprn = g.ukprn)
+)
+
+select urn from school_mi
+union
+select urn from fe

pipeline/transform/models/intermediate/int_ofsted_listed.yml

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+version: 2
+
+unit_tests:
+  - name: int_ofsted_listed_includes_uninspected_schools_and_fe_providers
+    description: >
+      Abbas and Templecombe (150031) is in Ofsted's school MI with no inspection;
+      Exeter and North Devon Colleges Group (130645) is in the FE MI with none;
+      a UKPRN-only FE match counts too. A school in neither is absent (audit H4).
+    model: int_ofsted_listed
+    given:
+      - input: source('raw', 'ofsted_inspections')
+        rows:
+          - {urn: '150031', inspection_date: 'NULL'}
+          - {urn: '102408', inspection_date: '17/06/2025'}
+      - input: ref('stg_gias_ukprn')
+        rows:
+          - {urn: 130645, ukprn: null}
+          - {urn: 5, ukprn: '10099999'}
+          - {urn: 133058, ukprn: null}
+      - input: ref('stg_ofsted_fe_providers')
+        rows:
+          - {provider_urn: 130645, provider_ukprn: null}
+          - {provider_urn: 9999999, provider_ukprn: '10099999'}
+    expect:
+      rows:
+        - {urn: 150031}
+        - {urn: 102408}
+        - {urn: 130645}
+        - {urn: 5}