When gitRefsPath is empty (not in a git repo), strings.HasPrefix(path, "")
always returns true, causing every file write in .beads/ directory
(including daemon.log) to trigger debouncer and create an event storm.
This fix adds a check to ensure gitRefsPath is not empty before the
HasPrefix comparison.
Fixes the issue where daemon.log grows rapidly (17MB+) due to the
self-triggering loop: write log -> detect change -> write log -> ...
Co-authored-by: Test User <test@example.com>
b3d64d47b3