[REFACTOR](build) Migrate workspace to uv_build and PEP 420 namespace packages

Makefile

@@ -1,4 +1,4 @@
-.PHONY: default uv-sync clean-pyspark generate-pyspark check test-all test test-only docformat docformat-only doctest doctest-only mypy mypy-only lint-only update-baselines
+.PHONY: default uv-sync clean-pyspark generate-pyspark check check-namespace test-all test test-only docformat docformat-only doctest doctest-only mypy mypy-only lint-only update-baselines
 
 TESTMON ?= --testmon
 
@@ -23,7 +23,23 @@ generate-pyspark: uv-sync clean-pyspark
 	@uv run ruff format --quiet $(PYSPARK_EXPRESSIONS) $(PYSPARK_GENERATED_TESTS)
 
 check: uv-sync generate-pyspark
-	@$(MAKE) -j test-only docformat-only doctest-only lint-only mypy-only
+	@$(MAKE) -j test-only docformat-only doctest-only lint-only mypy-only check-namespace
+
+# Guard the PEP 420 namespace roots. overture/ and overture/schema/ are
+# implicit namespace packages -- no __init__.py -- so every workspace package
+# contributes its own leaf under the shared namespace. An __init__.py at either
+# root turns that package into a regular package that shadows every other
+# distribution's contribution at import time. -path patterns (not shell globs)
+# keep this shell-independent and match only the two roots, never the leaves.
+check-namespace:
+	@found=$$(find packages -type f -path '*/src/overture/__init__.py' \
+	              -o -type f -path '*/src/overture/schema/__init__.py'); \
+	if [ -n "$$found" ]; then \
+		echo "ERROR: __init__.py at PEP 420 namespace root(s) -- delete these:" >&2; \
+		echo "$$found" >&2; \
+		echo "overture/ and overture/schema/ must stay implicit namespace packages." >&2; \
+		exit 1; \
+	fi
 
 # test-all is the unconditional full run -- testmon-independent, unlike the
 # incremental test/test-only targets -- so data-only changes (golden JSON,

packages/overture-schema-addresses-theme/pyproject.toml

@@ -25,11 +25,11 @@ overture-schema-system = { workspace = true }
 
 
 [build-system]
-build-backend = "hatchling.build"
-requires = ["hatchling"]
+requires = ["uv_build>=0.11.32,<0.13"]
+build-backend = "uv_build"
 
-[tool.hatch.build.targets.wheel]
-packages = ["src/overture"]
+[tool.uv.build-backend]
+module-name = "overture.schema.addresses"
 
 [tool.pytest.ini_options]
 pythonpath = ["src"]

packages/overture-schema-addresses-theme/tests/test_address_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.addresses import Address
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-base-theme/pyproject.toml

@@ -25,11 +25,11 @@ overture-schema-system = { workspace = true }
 
 
 [build-system]
-build-backend = "hatchling.build"
-requires = ["hatchling"]
+requires = ["uv_build>=0.11.32,<0.13"]
+build-backend = "uv_build"
 
-[tool.hatch.build.targets.wheel]
-packages = ["src/overture"]
+[tool.uv.build-backend]
+module-name = "overture.schema.base"
 
 [project.entry-points."overture.models"]
 bathymetry = "overture.schema.base:Bathymetry"

packages/overture-schema-base-theme/tests/test_bathymetry_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.base import Bathymetry
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-base-theme/tests/test_infrastructure_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.base import Infrastructure
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-base-theme/tests/test_land_cover_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.base import LandCover
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-base-theme/tests/test_land_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.base import Land
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-base-theme/tests/test_land_use_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.base import LandUse
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-base-theme/tests/test_water_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.base import Water
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-buildings-theme/pyproject.toml

@@ -25,11 +25,11 @@ overture-schema-system = { workspace = true }
 
 
 [build-system]
-build-backend = "hatchling.build"
-requires = ["hatchling"]
+requires = ["uv_build>=0.11.32,<0.13"]
+build-backend = "uv_build"
 
-[tool.hatch.build.targets.wheel]
-packages = ["src/overture"]
+[tool.uv.build-backend]
+module-name = "overture.schema.buildings"
 
 [project.entry-points."overture.models"]
 building = "overture.schema.buildings:Building"

packages/overture-schema-buildings-theme/tests/test_building_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.buildings.building import Building
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-buildings-theme/tests/test_building_part_json_schema_baseline.py

@@ -3,6 +3,7 @@
 from pathlib import Path
 
 import pytest
+
 from overture.schema.buildings.building_part import BuildingPart
 from overture.schema.system.testing import assert_json_schema_golden
 

packages/overture-schema-cli/pyproject.toml

@@ -28,8 +28,8 @@ overture-schema-common = { workspace = true }
 overture-schema-system = { workspace = true }
 
 [build-system]
-build-backend = "hatchling.build"
-requires = ["hatchling"]
+requires = ["uv_build>=0.11.32,<0.13"]
+build-backend = "uv_build"
 
 [dependency-groups]
 dev = [
@@ -38,8 +38,8 @@ dev = [
     "mypy>=1.17.0",
 ]
 
-[tool.hatch.build.targets.wheel]
-packages = ["src/overture"]
+[tool.uv.build-backend]
+module-name = "overture.schema.cli"
 
 [project.scripts]
 overture-schema = "overture.schema.cli:cli"

packages/overture-schema-cli/tests/test_cli_commands.py

@@ -6,6 +6,7 @@
 import pytest
 from click.testing import CliRunner
 from conftest import build_feature
+
 from overture.schema.cli.commands import cli
 
 

packages/overture-schema-cli/tests/test_cli_functions.py

@@ -9,6 +9,8 @@
 import yaml
 from click.exceptions import UsageError
 from conftest import build_feature
+from pydantic import BaseModel, ValidationError
+
 from overture.schema.cli.commands import (
     _best_fit_model,
     _revalidate_undiscriminatable_items,
@@ -19,7 +21,6 @@
 from overture.schema.cli.type_analysis import get_item_index
 from overture.schema.cli.types import ValidationErrorDict
 from overture.schema.system.discovery import TagSelector
-from pydantic import BaseModel, ValidationError
 
 
 class TestLoadInput:

packages/overture-schema-cli/tests/test_data_display.py

@@ -3,14 +3,15 @@
 from io import StringIO
 
 from conftest import build_feature
+from rich.console import Console
+from rich.panel import Panel
+
 from overture.schema.cli.data_display import (
     create_feature_display,
     extract_feature_data,
     format_field_value,
     select_context_fields,
 )
-from rich.console import Console
-from rich.panel import Panel
 
 
 class TestExtractFeatureData:

packages/overture-schema-cli/tests/test_error_formatting.py

@@ -6,6 +6,9 @@
 
 import pytest
 from click.testing import CliRunner
+from pydantic import BaseModel, Field, TypeAdapter, ValidationError
+from rich.console import Console
+
 from overture.schema.cli.commands import cli
 from overture.schema.cli.error_formatting import (
     format_path,
@@ -14,8 +17,6 @@
 )
 from overture.schema.cli.type_analysis import introspect_union
 from overture.schema.cli.types import ErrorLocation, ValidationErrorDict
-from pydantic import BaseModel, Field, TypeAdapter, ValidationError
-from rich.console import Console
 
 
 class TestErrorGrouping:

packages/overture-schema-cli/tests/test_heterogeneous_collections.py

@@ -6,6 +6,7 @@
 import pytest
 from click.testing import CliRunner
 from conftest import build_feature
+
 from overture.schema.cli.commands import cli
 
 

packages/overture-schema-cli/tests/test_resolve_types.py

@@ -9,6 +9,7 @@
 from unittest.mock import patch
 
 import pytest
+
 from overture.schema.cli.commands import resolve_types
 from overture.schema.system.discovery import ModelKey, TagSelector
 

packages/overture-schema-cli/tests/test_type_analysis.py

@@ -3,14 +3,15 @@
 from typing import Annotated, Literal
 
 import pytest
+from pydantic import BaseModel, Discriminator, Field
+
 from overture.schema.cli.type_analysis import (
     StructuralTuple,
     create_structural_tuple,
     extract_discriminator_path,
     get_or_create_structural_tuple,
     introspect_union,
 )
-from pydantic import BaseModel, Discriminator, Field
 
 
 class TestStructuralTuples:

packages/overture-schema-codegen/pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
-build-backend = "hatchling.build"
-requires = ["hatchling"]
+requires = ["uv_build>=0.11.32,<0.13"]
+build-backend = "uv_build"
 
 [project]
 dependencies = [
@@ -42,5 +42,5 @@ test = [
     "overture-schema-transportation-theme",
 ]
 
-[tool.hatch.build.targets.wheel]
-packages = ["src/overture"]
+[tool.uv.build-backend]
+module-name = "overture.schema.codegen"