feat(cli): added agent Ai

[duboolivier]

Description

Add a CLAUDE.md conventions guide and three specialized AI subagents (cloud-v2-sync, resource-scaffold, reviewer) under .claude/agents/ to assist CLI development. Docs/tooling only — no CLI code changes.
Please include a summary of the changes and the related issue if applicable.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (improvement of existing commands)
• Breaking change (fix or feature that can break a current behavior)
• Documentation update

Checklist:

• My code follows the style guidelines of this project
• I have commented my code
• I ran go mod tidy
• I have added tests that prove my fix is effective or that my feature works

[amstuta]

The content of this PR is good, but you should check if there is a convention to place these files so that they can be read from other tools than Claude (at least Copilot should work also).
Also, please check if the review agent can be used directly for the review when asking for a Copilot review on this repo.