Use published mcdsl v1.0.0, drop replace directive

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/git.wntrmute.dev/kyle/mcdsl/db/db.go

@@ -59,6 +59,12 @@ func Open(path string) (*sql.DB, error) {
 		}
 	}
 
+	// SQLite supports concurrent readers but only one writer. With WAL mode,
+	// reads don't block writes, but multiple Go connections competing for
+	// the write lock causes SQLITE_BUSY under concurrent load. Limit to one
+	// connection to serialize all access and eliminate busy errors.
+	database.SetMaxOpenConns(1)
+
 	// Ensure permissions are correct even if the file already existed.
 	if err := os.Chmod(path, 0600); err != nil {
 		_ = database.Close()