66c88ddfae
Harvest the UpdateThreadRequest workspace field from PR #2640 while keeping the engine-cache correctness fix: PATCH /v1/threads/{id} now persists workspace changes, emits the workspace change in thread.updated, rejects empty paths, rejects workspace changes while a turn is active, and evicts idle cached engines so the next turn starts in the new workspace. Validation: cargo fmt --all -- --check; git diff --check; cargo test -p codewhale-tui --bin codewhale-tui --locked update_thread_workspace -- --nocapture; cargo clippy -p codewhale-tui --locked -- -D warnings; python3 scripts/check-coauthor-trailers.py --author-map .github/AUTHOR_MAP --range origin/main..HEAD --check-authors. Harvested from PR #2640 by @gaord. Co-authored-by: gaord <9567937+gaord@users.noreply.github.com>