[SIMPL-30451] Add distributed-execution service with guide and reference implementations

Canonical location for documentation, example workflows and reference service implementations covering distributed execution patterns. Covers AC1-AC4: execution-target selection, decision support, readiness checks and code-level linkage. Tightly coupled jobs and the loosely coupled subprocess transport are verified by the test suite; the Kubernetes pipes transport is implemented but not yet cluster-run and is marked as such in the guide.

Changelog: added

pyproject.toml

@@ -0,0 +1,40 @@
+[project]
+name = "distributed_execution"
+version = "0.1.0"
+description = "Reference implementations and user guide for Dagster distributed execution targets and integration patterns"
+requires-python = ">=3.12"
+dependencies = [
+    "dagster",
+    "dagster-k8s>=0.27.16",
+    "dagster-postgres>=0.27.16",
+    "dagster-webserver>=1.11.16",
+    "pip>=26.1.2",
+    "pydantic>=2.0",
+]
+
+[dependency-groups]
+dev = [
+    "pytest>=8.4.2",
+    "pytest-cov>=7.0.0",
+]
+
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools.package-data]
+distributed_execution = ["*.py"]
+
+[tool.black]
+line-length = 120
+target-version = ['py312']
+
+[tool.pytest.ini_options]
+pythonpath = ["src"]
+testpaths = ["tests"]