In contributor mode (bd init --contributor), .beads/ is excluded in
.git/info/exclude to prevent committing upstream issue databases.
However, this exclusion applies to ALL worktrees, including the sync
worktree where .beads/ must be committed.
The fix adds -f flag to git add in commitInWorktree() to force-add
files even when gitignored. This follows the existing pattern in
beads where -f is used for worktree operations (git worktree add -f).
Fixes: bd sync failing with "git add failed in worktree: exit status 1"
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Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
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