The ListOptions struct defaults Priority to 0 (Go zero value), which
caused bd list to filter to only P0 merge requests. This fix explicitly
sets Priority: -1 to disable priority filtering.
Root cause: beads.ListOptions{Type: "merge-request"} created opts with
Priority=0, passing --priority=0 to bd, filtering out P1-P4 MRs.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>