v2.4.0 - Cost-saving Codex worker release

Initial public release of MCP Codex Worker.

Highlights:

• Async Codex worker tools: start/get/tail/wait/cancel
• Read-only analyze tool for cheap summaries
• Anthropic-to-OpenAI adapter for OpenAI-compatible gateways
• 429/5xx retry handling with Retry-After support
• include_diff:false for compact Codex return payloads
• Gateway token metrics JSONL
• Optional fallback gateway and worktree isolation
• Sandbox, scoped patch checks, and secret redaction

Validation:

• npm run build
• npm run test
• npm run smoke
• npm pack --dry-run

Known setup note:

• CI workflow is not included yet because the provided token lacks GitHub workflow scope. Add it with a token that has workflow permission.