"""
SQL Agent — AI-powered SQL analysis with ReAct agent pattern.

Modules:
  - trace_agent:      Core ReAct loop (THINK→PLAN→ACT→OBSERVE→REFLECT)
  - tools:            SQL execution, calculator, result serialization
  - session_manager:  In-memory session state management
  - persistence:      PostgreSQL save/load for trace sessions
  - prompts:          LLM system prompts
  - core:             Legacy shared utilities (validate_sql, call_llm, etc.)
"""
