Update skills for latest PlanetScale changelog

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Summary

Updates PlanetScale skill guidance for changelog entries published on 2026-08-12:

• https://planetscale.com/changelog/terraform-vitess-keyspaces-and-vtgates — adds guidance for Terraform-managed Vitess keyspaces, VTGate settings, and safe migrations, including approval-gate treatment for topology and capacity changes.
• https://planetscale.com/changelog/cli-insights-tags — documents pscale insights tags, tags show, and tags summaries as read-only tag attribution surfaces.
• https://planetscale.com/changelog/cli-insights-query-samples — documents pscale insights queries samples, including the sensitivity of full SQL samples and tag values in shared reports.
• https://planetscale.com/changelog/cli-insights-recommendations-dismiss — classifies schema recommendation dismissal as a state-changing workflow action requiring approval, evidence, and a reason.

Validation

• git diff --check
• script/setup "$tmpdir" copied all 15 skill directories to a temporary target