feat(dolt): auto-commit write commands and set explicit commit authors (#1270)

Adds Dolt auto-commit functionality for write commands and sets explicit commit authors.

Includes fix for race condition in commandDidWrite (converted to atomic.Bool).

Original PR: #1267 by @coffeegoddd
Co-authored-by: Dustin Brown <dustin@dolthub.com>

cmd/bd/sync.go

@@ -742,6 +742,8 @@ func doExportSync(ctx context.Context, jsonlPath string, force, dryRun bool) err
 			fmt.Println("⚠ Dolt remote not available, falling back to JSONL-only")
 		} else {
 			fmt.Println("→ Committing to Dolt...")
+			// We are explicitly creating a Dolt commit inside sync; avoid redundant auto-commit in PersistentPostRun.
+			commandDidExplicitDoltCommit = true
 			if err := rs.Commit(ctx, "bd sync: auto-commit"); err != nil {
 				// Ignore "nothing to commit" errors
 				if !strings.Contains(err.Error(), "nothing to commit") {