Update skills for new MCP diagnostics

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Summary

• Added MCP query-error tools as read-only Insights diagnostics across inventory, Query Insights, MCP operating-model, matrix, and report guidance.
• Added MCP Postgres server logs as scoped read-only operational evidence, with cautions against copying raw logs into reports or public artifacts.
• Classified new CLI/MCP payment-method surfaces as human-gated billing workflows rather than autonomous agent actions.

Changelog entries

• https://planetscale.com/changelog/mcp-query-errors — adds planetscale_list_query_error_patterns and planetscale_list_query_error_executions, which affect Insights/query-failure guidance.
• https://planetscale.com/changelog/mcp-postgres-logs — adds planetscale_get_postgres_logs, which affects Postgres diagnostics and report evidence handling.
• https://planetscale.com/changelog/cli-mcp-payment-method — adds CLI/MCP payment-method workflows, which affects safety and approval guidance for autonomous agents.

Verification

• git diff --check