research

@tyrchen

Vendor reference repos as git submodules under ./vendors and produce deep research memos under ./docs/research covering architecture, design, key data structures, and load-bearing algorithms. Use whenever the user says "do research on X", "study how Y works", "submodule this repo and look into it", "understand the design of Z before we start", "spike on …", references prior-art crates / repos that should be evaluated, or asks to refer to ./vendors before designing or implementing. Trigger even when the user does not say the word "research" if they paste GitHub URLs and ask Codex to learn from them, compare alternatives, or extract patterns.