MCP server bridging Claude Code and GPT Codex for collaborative
code review, planning, and brainstorming.

Tools:
- codex_ask: brainstorming with decision memo format
- codex_review: code review with evidence mode (default on)
- codex_plan: collaborative planning with testable invariants
- codex_risk_radar: diff risk analysis and collaboration routing
- codex_stats: session metrics and round-trip tracking
- codex_reset: clear session and working memory

Features:
- Working memory: auto-shares plan, radar, findings between tools
- Evidence mode: requires severity, confidence, repro, fix per finding
- Risk radar: 8-category heuristic scoring with file attribution
- Bounded session: ring buffer + char budget + injection-resistant labels
- Adversarial system prompt with 6 reasoning angles
- Benchmark suite: 12 hand-crafted samples, HuggingFace importer,
  bake-off integration test (8 planted bugs, 31 tests)

Benchmark: 93%+ catch rate, 97% signal-to-noise ratio