Update skills for August 26 PlanetScale changelog

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Summary

• Updated PlanetScale skill guidance for the August 26 changelog entries that materially affect CLI/MCP operation, read-only evidence collection, and approval gates.
• Added the new MCP query-tag tools, CLI Insights query drill-downs, specialized metrics commands, schema recommendation detail lookup, database region listing, Postgres switchover inspection, and Postgres restore-point branch behavior.
• Classified newly exposed state-changing or sensitive surfaces, including backup protection, org/team management, service tokens, billing invoices/payment metadata, and restore/switchover operations.

Changelog entries

• https://planetscale.com/changelog/cli-postgres-restore-point
• https://planetscale.com/changelog/cli-postgres-switchover-status
• https://planetscale.com/changelog/cli-service-token-show
• https://planetscale.com/changelog/cli-database-regions
• https://planetscale.com/changelog/cli-backup-protected
• https://planetscale.com/changelog/cli-metrics-specialized
• https://planetscale.com/changelog/cli-insights-recommendations-show
• https://planetscale.com/changelog/cli-insights-query-detail
• https://planetscale.com/changelog/cli-billing-invoices
• https://planetscale.com/changelog/cli-org-update-teams
• https://planetscale.com/changelog/mcp-query-tags

Verification

• git diff --check