Update to Aivana Database Engineer

{
  "name": "ai-query-rewrite-lab",
  "description": "Generate safe query rewrite candidates with deterministic explainability without executing SQL.",
  "included_files": [],
  "skill_md_contents": "---\nname: ai-query-rewrite-lab\ndescription: Generate safe query rewrite candidates with deterministic explainability without executing SQL.\n---\n\n# AI Query Rewrite Lab\n\nUse this skill to propose safer or cheaper SQL variants before running EXPLAIN\nor executing a statement.\n\nRun:\n\n```bash\nnode runtime/runTool.js ai_query_rewrite_lab '{\"engine\":\"postgres\",\"database\":\"analytics\",\"schema\":\"public\",\"table\":\"events\",\"sql\":\"SELECT * FROM events WHERE user_email = ''a@example.com''\"}'\n```\n\nThe lab never executes SQL. It returns rewrite candidates, expected impact\nranges, applied rewrite rules, and a safety block that marks the output as\nanalysis-only.\n"
}