Fixed config loading so assist finds assist.yml when invoked from a subdirectory of the repo. Previously loadConfig only looked in the current working directory, which meant commands failed silently when you were deeper in the tree. Now it walks up to the repo root using a shared findRepoRoot helper that was already in the .NET commands — extracted it to src/shared/ so both paths can reuse it.

Also refined the /review-comments Claude command to group PR comments by thread rather than processing each comment individually. Follow-up comments (like a reviewer endorsing a bot suggestion) are now presented as context alongside the primary actionable comment, and fixed/wontfix is only called once per thread.