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

api/analyses/compare_periods.py

@@ -18,8 +18,8 @@ from api.analyses.types import Finding
 from api.llm import chat
 from api.prompts import load, render
 from api.runtime import events
+from api.recon import load_recon
 from api.tools.execute_sql import execute_sql
-from api.tools.schema import load_schema
 
 logger = logging.getLogger("nvi.analyses.compare_periods")
 
@@ -110,7 +110,7 @@ class ComparePeriods(Analysis):
 
 
 def _generate_pair(question: str, period_a: str, period_b: str) -> dict[str, dict[str, str]]:
-    schema = load_schema()
+    schema = load_recon()
     text = chat(
         system=load("compare_periods.pair"),
         user=render(