recon + sqlglot validator + drill_down package; guard ReAct dimension picks against candidate list

api/analyses/registry.py

@@ -7,10 +7,12 @@ from typing import Any
 from api.analyses.base import Analysis
 from api.analyses.compare_periods import ComparePeriods
 from api.analyses.direct_answer import DirectAnswer
+from api.analyses.drill_down import DrillDown
 
 REGISTRY: dict[str, Analysis] = {
     DirectAnswer.name: DirectAnswer(),
     ComparePeriods.name: ComparePeriods(),
+    DrillDown.name: DrillDown(),
 }