Add persistent user preference recall across Codex CLI conversations

@adrian.a.adewunmi yeah this is the exact gap — AGENTS.md tells the tool “how this project works” but nothing about “how I like to work.” I hit the same wall and ended up building an MCP server that keeps user stuff and project stuff separate. So my commit format, PR style, language preference — that follows me everywhere. But project-specific context stays in that project folder, doesn’t leak into other repos. When I open a brand new repo in Codex it already knows how I work without me repeating anything. That’s the part that really cuts the friction. Your layered idea (repo instructions → user defaults → per-chat overrides) is spot on. MCP makes this pretty easy to wire up since any compatible client reads from the same local store.