fix: skip beads restore when directory is redirected (bd-lmqhe)

When a repo has a .beads/redirect file pointing to a shared beads
directory, restoreBeadsDirFromBranch would fail because it runs
git checkout from the local repo but with a path outside that repo.

Skip the restore when the beads directory is redirected since the
beads dir is managed by a different repo anyway.

Fixes: bd-lmqhe

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/sync_git.go

@@ -455,6 +455,14 @@ func restoreBeadsDirFromBranch(ctx context.Context) error {
 		return fmt.Errorf("no .beads directory found")
 	}
 
+	// Skip restore when beads directory is redirected (bd-lmqhe)
+	// When redirected, the beads directory is in a different repo, so
+	// git checkout from the current repo won't work for paths outside it.
+	redirectInfo := beads.GetRedirectInfo()
+	if redirectInfo.IsRedirected {
+		return nil
+	}
+
 	// Restore .beads/ from HEAD (current branch's committed state)
 	// Using -- to ensure .beads/ is treated as a path, not a branch name
 	cmd := exec.CommandContext(ctx, "git", "checkout", "HEAD", "--", beadsDir) //nolint:gosec // G204: beadsDir from FindBeadsDir(), not user input