fakesnow

Inspect the Git diff from `main...HEAD` to identify tests it added or changed, validate the applicable runtime behavior against a real Snowflake instance, and produce a concise report of failures and behavioral differences. Use when a user asks to run tests from the current branch on real Snowflake, compare fake/local Snowflake behavior to actual Snowflake behavior, or verify whether newly added Snowflake-facing tests match live semantics.