Three gitlinks (mode 160000) existed in the index with no .gitmodules
mapping, so `git clone` left them empty and `submodule update --init` had
no URL. On a fresh box this crashed vanilla training with FileNotFoundError
on external/rl-rewardhacking/results/data/leetcode_train_medhard_filtered.jsonl.
Add .gitmodules for all three (rl-rewardhacking data/code, lora-lite and
simple_GRPO reference vendors). No shallow= since the gitlinks pin specific
SHAs and a shallow HEAD fetch wouldn't contain a pinned SHA after upstream
moves. Document the clone step in handover fresh-box setup.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
wassname