Fix daemon sync branch commit failing with pre-commit hooks

When pre-commit hooks are installed (via "bd hooks install"), daemon auto-sync
to sync branches fails with "git commit failed in worktree: exit status 1".

Root cause:
- gitCommitInWorktree() was missing --no-verify flag
- Pre-commit hook runs "bd sync --flush-only" which fails in worktree context
- Worktree has .beads directory, triggering hook execution
- Hook fails because bd cannot find proper database in worktree path

The fix adds --no-verify to git commit in gitCommitInWorktree(), matching
the existing implementation in internal/syncbranch/worktree.go line 684.

This is correct because:
- Worktree commits are internal to bd sync operations
- Running pre-commit hooks in worktree context is semantically wrong
- The library function already skips hooks for this reason

Includes regression test that:
- Creates a repo with sync branch configured
- Installs a failing pre-commit hook (simulating bd hook behavior)
- Verifies commits succeed because --no-verify bypasses the hook
- Tests multiple consecutive commits to ensure consistent behavior

Tested manually by:
1. Creating issue with "bd create" (triggers mutation event)
2. Verifying daemon logs show successful commit to sync branch
3. Confirming push to remote sync branch completes

cmd/bd/daemon_sync_branch.go

@@ -151,8 +151,9 @@ func gitCommitInWorktree(ctx context.Context, worktreePath, filePath, message st
 		return fmt.Errorf("git add failed in worktree: %w", err)
 	}
 	
-	// Commit
-	commitCmd := exec.CommandContext(ctx, "git", "-C", worktreePath, "commit", "-m", message)
+	// Commit with --no-verify to skip hooks (pre-commit hook would fail in worktree context)
+	// The worktree is internal to bd sync, so we don't need to run bd's pre-commit hook
+	commitCmd := exec.CommandContext(ctx, "git", "-C", worktreePath, "commit", "--no-verify", "-m", message)
 	output, err := commitCmd.CombinedOutput()
 	if err != nil {
 		return fmt.Errorf("git commit failed in worktree: %w\n%s", err, output)