v0.5.2 — Source-table-direct baseline, UNION SQL gen, optimize hint, ANALYZE TABLE Key changes: - Source-table-direct battery runner (no managed edges) - UNION / UNION ALL SQL generation for SQL-only backends - execution_mode='sql' on direct runner (no silent fallbacks) - optimize parameter on engine + /*+ optimize=false */ query hint - --analyze flag for COMPUTE STATISTICS on all tables - Spark installed on a remote host (Java 17 + PySpark 4.1.1) Performance (SF10, cold-cache): - Direct: 199/201, 19.7 min (2.2x faster than managed) - Managed: 201/201, 43.8 min