Add Clash of Perps AI agent skill

[egorble]

Summary

• Add a Bankr-compatible SKILL.md for Clash of Perps AI agents.
• Documents the hosted MCP endpoint, cop_ai bearer-key auth, base management tools, ship/troop workflows, and AI battle best practices.
• Includes safety rules for grid usage, cannon targeting, cooldown handling, and secret handling.

Testing

• Verified SKILL.md starts with YAML frontmatter and includes name/description metadata.
• Verified file size is 6.9 KB, below the 100 KB per-file limit.
• Ran git diff --check on the new skill file.