Add OpenClaw local and Mac mini setup skill

infrastructure/databases/planetscale/SKILL.md

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+---
+name: planetscale
+description: Operate MySQL-compatible databases on PlanetScale with branching workflows, safe migrations, and production rollouts.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# PlanetScale
+
+Use PlanetScale for serverless MySQL with non-blocking schema change workflows.
+
+## Branching Workflow
+
+1. Create a database branch for schema work.
+2. Apply migrations to the branch.
+3. Open a deploy request and run checks.
+4. Merge to production during low-risk windows.
+
+## Operational Best Practices
+
+- Keep schema changes backward compatible first.
+- Use connection pooling for serverless apps.
+- Monitor query insights for slow statements.
+- Define rollback strategy for every deploy request.
+
+## Related Skills
+
+- [mysql](../mysql/) - MySQL tuning fundamentals
+- [database-backups](../database-backups/) - Recovery planning