Add postcode mapping

Taskfile.data.yml

@@ -25,6 +25,10 @@ vars:
   POSTCODES_OUTPUT: "{{.DATA_DIR}}/postcodes"
   GEOSURE_OUTPUT: "{{.DATA_DIR}}/geosure"
   GEOSURE_PARQUET: "{{.DATA_DIR}}/geosure.parquet"
+  INSPIRE_OUTPUT: "{{.DATA_DIR}}/inspire"
+  OA_BOUNDARIES_OUTPUT: "{{.DATA_DIR}}/oa_boundaries.gpkg"
+  UPRN_LOOKUP_OUTPUT: "{{.DATA_DIR}}/uprn_lookup.parquet"
+  POSTCODE_BOUNDARIES_OUTPUT: "{{.DATA_DIR}}/postcode_boundaries"
 
 tasks:
   download:tiles:
@@ -216,6 +220,43 @@ tasks:
     cmds:
       - uv run python -m pipeline.transform.transform_geosure --geosure {{.GEOSURE_OUTPUT}} --arcgis {{.ARCGIS_OUTPUT}} --output {{.GEOSURE_PARQUET}}
 
+  download:inspire:
+    desc: Download INSPIRE Index Polygon GML files from HM Land Registry
+    status:
+      - test -d {{.INSPIRE_OUTPUT}}
+    cmds:
+      - uv run python -m pipeline.download.inspire --output {{.INSPIRE_OUTPUT}}
+
+  download:oa-boundaries:
+    desc: Download Output Areas (2021) boundary polygons (England & Wales)
+    status:
+      - test -f {{.OA_BOUNDARIES_OUTPUT}}
+    cmds:
+      - uv run python -m pipeline.download.oa_boundaries --output {{.OA_BOUNDARIES_OUTPUT}}
+
+  download:uprn-lookup:
+    desc: Download National Statistics UPRN Lookup and convert to parquet
+    status:
+      - test -f {{.UPRN_LOOKUP_OUTPUT}}
+    cmds:
+      - uv run python -m pipeline.download.uprn_lookup --output {{.UPRN_LOOKUP_OUTPUT}}
+
+  transform:postcode-boundaries:
+    desc: Generate postcode boundary polygons from OA boundaries + INSPIRE + UPRNs
+    deps:
+      - download:oa-boundaries
+      - download:inspire
+      - download:uprn-lookup
+    status:
+      - test -d {{.POSTCODE_BOUNDARIES_OUTPUT}}/units
+    cmds:
+      - >-
+        uv run python -m pipeline.transform.postcode_boundaries
+        --uprn {{.UPRN_LOOKUP_OUTPUT}}
+        --oa-boundaries {{.OA_BOUNDARIES_OUTPUT}}
+        --inspire {{.INSPIRE_OUTPUT}}
+        --output {{.POSTCODE_BOUNDARIES_OUTPUT}}
+
   download:journey-times:
     desc: "Fetch TfL journey times: task download:journey-times"
     deps: