Update skills for pricing catalog and dashboard connections

[cursor]

Summary

• Add the public read-only pricing catalog as the evidence source for PlanetScale SKU, region, and monthly-rate facts.
• Document the dashboard Connections page as a read-only inspection surface for Postgres and Vitess live sessions.
• Classify dashboard query cancellation and connection termination as approval-gated operational actions, with production use treated as availability-impacting.

Changelog entries

• https://planetscale.com/changelog/query-pricing-with-sql
• https://planetscale.com/changelog/connections-dashboard

Why

These changelog entries add agent-relevant surfaces for evidence gathering and operational triage. The affected skills now direct agents to use live pricing data for monetary facts and to treat dashboard connection interruption controls separately from read-only assessment.

Verification

• git diff --check HEAD~1 HEAD