Upgrade policyengine to 0.9.0 for ECPS default

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: anth-volk

projects/policyengine-api-simulation/pyproject.toml

@@ -16,7 +16,7 @@ dependencies = [
     "pydantic-settings (>=2.7.1,<3.0.0)",
     "opentelemetry-instrumentation-fastapi (>=0.51b0,<0.52)",
     "policyengine-fastapi",
-    "policyengine==0.8.1",
+    "policyengine==0.9.0",
     "policyengine-uk>=2.22.8",
     "policyengine-us>=1.370.2",
     "tables>=3.10.2",