Implement Codex CLI provider for code review

[biwakonbu]

Overview

Implement ReviewProvider support for Codex CLI as the third AI agent tool integration.

Prerequisites

• ReviewProvider interface design completed
• At least one provider (Cursor CLI or Claude Code) implemented

Scope

• Implement CodexReviewProvider following established patterns
• Configure Codex CLI-specific invocation
• Set up prompt templates for Codex
• Add configuration options specific to Codex CLI
• Test integration with actual Codex CLI

Implementation Tasks

• Create CodexReviewProvider implementation
• Define Codex CLI-specific configuration schema
• Implement prompt template rendering for Codex
• Add CLI invocation and output parsing
• Handle authentication (if needed)
• Add integration tests
• Document configuration options

Success Criteria

• Codex CLI can be selected as review provider
• Configuration allows Codex-specific customization
• Code review workflow works end-to-end with Codex CLI
• Documentation includes Codex CLI setup instructions

Labels

enhancement, code-review, ai-integration