The TestIntegration test was flaky because it uses the real .beads directory
and the SQLite database could be out of sync with the JSONL file (e.g., after
git pull updates the JSONL but before the database is re-imported).
The fix runs `bd sync --import-only` at the start of the test to ensure
the database is synchronized before running the actual test operations.
Fixes gt-5ww96
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>