Add arduino-cli-suite curated skill

[ripred]

Summary

• Add a new curated skill at skills/.curated/arduino-cli-suite
• Provide a single self-contained Arduino CLI suite skill covering board discovery, core/library setup, sketch operations, compile/upload, monitor/debug, profiles, config, maintenance, daemon/grpc, and ecosystem specs
• Include per-skill MIT license, OpenAI metadata, icons, and bundled module references for progressive disclosure

What is included

• SKILL.md with orchestration workflow and captured ICL command examples
• agents/openai.yaml with display metadata and default prompt
• assets/icon-small.svg and assets/icon-large.svg
• references/*.md module guides used by the suite skill
• LICENSE.txt (MIT)

Validation

• Ran: python3 skills/.system/skill-creator/scripts/quick_validate.py skills/.curated/arduino-cli-suite
• Result: Skill is valid!

Notes

• The suite skill is self-contained (no cross-folder dependencies outside its own directory).
• The workflow/examples are based on real Arduino CLI usage, including Nano old bootloader build/upload flows.