Update to Aivana Database Engineer

{
  "name": "ai-data-contract-guardian",
  "description": "Check schema drift, required columns, PII declaration, retention, and governance controls against a declared data contract.",
  "included_files": [],
  "skill_md_contents": "---\nname: ai-data-contract-guardian\ndescription: Check schema drift, required columns, PII declaration, retention, and governance controls against a declared data contract.\n---\n\n# AI Data Contract Guardian\n\nUse this skill when validating table contracts before deploys, migrations, or\ndata product releases.\n\nRun:\n\n```bash\nnode runtime/runTool.js ai_data_contract_guardian '{\"engine\":\"postgres\",\"database\":\"analytics\",\"schema\":\"public\",\"table\":\"events\",\"contract\":{\"requiredColumns\":[\"event_id\",\"user_email\",\"created_at\"],\"piiColumns\":[\"user_email\"],\"retentionDays\":90}}'\n```\n\nThe output includes contract findings, a contract status, required governance\ncontrols, and evidence from catalog metadata. It is deterministic and does not\ncall an external AI service.\n"
}