Optimizes Snowflake SQL query performance from provided query text. Use when optimizing Snowflake SQL for:
(1) User provides or pastes a SQL query and asks to optimize, tune, or improve it
(2) Task mentions "slow query", "make faster", "improve performance", "optimize SQL", or "query tuning"
(3) Reviewing SQL for performance anti-patterns (function on filter column, implicit joins, etc.)
(4) User asks why a query is slow or how to speed it up
