feat(pipeline): add Meltano + dbt + Airflow ELT pipeline scaffold

Replaces the hand-rolled integrator with a production-grade ELT pipeline
using Meltano (Singer taps), dbt Core (medallion architecture), and
Apache Airflow (orchestration). Adds Typesense for search and PostGIS
for geospatial queries.

- 6 custom Singer taps (GIAS, EES, Ofsted, Parent View, FBIT, IDACI)
- dbt project: 12 staging, 5 intermediate, 12 mart models
- 3 Airflow DAGs (daily/monthly/annual schedules)
- Typesense sync + batch geocoding scripts
- docker-compose: add Airflow, Typesense; upgrade to PostGIS
- Portainer stack definition matching live deployment topology

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pipeline/plugins/extractors/tap-uk-idaci/pyproject.toml

@@ -0,0 +1,17 @@
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "tap-uk-idaci"
+version = "0.1.0"
+description = "Singer tap for UK IDACI deprivation index"
+requires-python = ">=3.10"
+dependencies = [
+    "singer-sdk~=0.39",
+    "requests>=2.31",
+    "pandas>=2.0",
+]
+
+[project.scripts]
+tap-uk-idaci = "tap_uk_idaci.tap:TapUKIDACI.cli"

pipeline/plugins/extractors/tap-uk-idaci/tap_uk_idaci/__init__.py

@@ -0,0 +1 @@
+"""tap-uk-idaci: Singer tap for IDACI (Income Deprivation Affecting Children Index)."""

pipeline/plugins/extractors/tap-uk-idaci/tap_uk_idaci/tap.py

@@ -0,0 +1,41 @@
+"""IDACI Singer tap — extracts deprivation index lookup data."""
+
+from __future__ import annotations
+
+from singer_sdk import Stream, Tap
+from singer_sdk import typing as th
+
+
+class IDACIStream(Stream):
+    """Stream: IDACI scores by LSOA."""
+
+    name = "idaci"
+    primary_keys = ["lsoa_code"]
+    replication_key = None
+
+    schema = th.PropertiesList(
+        th.Property("lsoa_code", th.StringType, required=True),
+        th.Property("idaci_score", th.NumberType),
+        th.Property("idaci_decile", th.IntegerType),
+    ).to_dict()
+
+    def get_records(self, context):
+        # TODO: Implement IDACI extraction
+        # Source: MHCLG IoD 2019 LSOA-level data
+        # Available as a static CSV download
+        self.logger.warning("IDACI extraction not yet implemented")
+        return iter([])
+
+
+class TapUKIDACI(Tap):
+    """Singer tap for UK IDACI data."""
+
+    name = "tap-uk-idaci"
+    config_jsonschema = th.PropertiesList().to_dict()
+
+    def discover_streams(self):
+        return [IDACIStream(self)]
+
+
+if __name__ == "__main__":
+    TapUKIDACI.cli()