ECHOES-1372 Add LLM guidelines and gitar review guidelines

[gregaubert]

Part of

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Summary by Gitar

• New AI assistant guidelines:
  • Added AGENTS.md and SKILL.md to define project-specific AI/LLM interaction patterns.
  • Added .gitar/review/ directory containing authoritative rules for automated code reviews.
• Review standards:
  • Established strict rules covering design tokens, accessibility, Radix UI patterns, and testing conventions.
  • Included specific requirements for component folder structures, named exports, and storybook coverage.
• Tooling configuration:
  • Updated .gitignore to include project-specific LLM context files and configuration paths.
  • Configured CLAUDE.md to point to the new AGENTS.md documentation.

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[hashicorp-vault-sonar-prod]

ECHOES-1372

[sonarqube-next]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0 Dependency risks
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[david-cho-lerat-sonarsource]

Well done 👍

[gitar-bot]

Code Review ✅ Approved 1 resolved / 1 findings

Documentation for LLM and review guidelines added, resolving the incorrect bare AGENT.md import in CLAUDE.md. No remaining issues found.

✅ 1 resolved

✅ Quality: CLAUDE.md uses bare 'AGENT.md' instead of '@AGENT.md' import

📄 CLAUDE.md:1 📄 AGENT.md:1-2 📄 AGENT.md:46
CLAUDE.md contains only the literal text AGENT.md (no @ prefix, no trailing newline). Claude Code resolves file imports via the @path syntax — which AGENT.md itself uses consistently (@README.md, @package.json, @.gitar/review/naming-and-api.md). As written, CLAUDE.md will be treated as containing the literal string AGENT.md rather than importing the file, so the intended redirection from CLAUDE.md to AGENT.md may not take effect.

Suggested fix: change the content to @AGENT.md so the AGENT.md instructions are actually pulled in.

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