Update PlanetScale skills for latest changelog entries

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Summary

Updates the PlanetScale skill guidance for new changelog entries published on 2026-07-08:

• https://planetscale.com/changelog/pscale-cli-agent-improvements
  • Clarifies that pscale 0.292.0+ includes the automation-focused pscale sql, pscale agent-guide, and structured JSON auth onboarding capabilities.
  • Documents that pscale sql blocks destructive statements by default and should only be re-run with --force after explicit approval of the exact statement and target.
• https://planetscale.com/changelog/postgres-role-with-replication
  • Adds Postgres inventory guidance to record roles with the REPLICATION attribute and confirm they map to approved logical replication/CDC workflows.
  • Updates Postgres safety and matrix guidance to treat replication capability as a narrow privilege for dedicated replication/CDC roles, not general application, analytics, or agent roles.

Verification

• git diff --check HEAD~1 HEAD