feat: Sprint 6 polish - methodology, demo data, deployment prep

- Add policy event markers to time series charts
- Create methodology page (/toronto/methodology) with data sources
- Add demo data module for testing without full pipeline
- Update README with project documentation
- Add health check endpoint (/health)
- Add database initialization script
- Export new figure factory functions

Closes #21

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/db/init_schema.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+"""Initialize database schema.
+
+Usage:
+    python scripts/db/init_schema.py
+
+This script creates all SQLAlchemy tables in the database.
+Run this after docker-compose up to initialize the schema.
+"""
+
+import sys
+from pathlib import Path
+
+# Add project root to path
+sys.path.insert(0, str(Path(__file__).parent.parent.parent))
+
+from portfolio_app.toronto.models import create_tables, get_engine  # noqa: E402
+
+
+def main() -> int:
+    """Initialize the database schema."""
+    print("Initializing database schema...")
+
+    try:
+        engine = get_engine()
+
+        # Test connection
+        with engine.connect() as conn:
+            result = conn.execute("SELECT 1")
+            result.fetchone()
+        print("Database connection successful")
+
+        # Create all tables
+        create_tables()
+        print("Schema created successfully")
+
+        # List created tables
+        from sqlalchemy import inspect
+
+        inspector = inspect(engine)
+        tables = inspector.get_table_names()
+        print(f"Created tables: {', '.join(tables)}")
+
+        return 0
+
+    except Exception as e:
+        print(f"Error: {e}", file=sys.stderr)
+        return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())