fix(smartshell): avoid triple shell nesting, improve WSL path filtering, and use chunked log buffer to reduce memory usage

ts/classes.shelllog.ts

@@ -5,7 +5,41 @@ import * as plugins from './plugins.js';
  * making sure the process doesn't run out of memory
  */
 export class ShellLog {
-  public logStore = Buffer.from('');
+  private chunks: Buffer[] = [];
+  private totalLength = 0;
+
+  /**
+   * Get the accumulated log as a single Buffer.
+   * Concatenation happens lazily only when accessed.
+   */
+  public get logStore(): Buffer {
+    if (this.chunks.length === 0) {
+      return Buffer.alloc(0);
+    }
+    if (this.chunks.length === 1) {
+      return this.chunks[0];
+    }
+    // Flatten chunks into a single buffer
+    const combined = Buffer.concat(this.chunks, this.totalLength);
+    // Replace chunks array with the single combined buffer for future access
+    this.chunks = [combined];
+    return combined;
+  }
+
+  /**
+   * Set the log store directly (used for truncation).
+   */
+  public set logStore(value: Buffer) {
+    this.chunks = [value];
+    this.totalLength = value.length;
+  }
+
+  /**
+   * Get the current total length of buffered data without concatenating.
+   */
+  public get logLength(): number {
+    return this.totalLength;
+  }
 
   /**
    * log data to console
@@ -22,13 +56,9 @@ export class ShellLog {
    */
   public addToBuffer(dataArg: string | Buffer): void {
     // make sure we have the data as Buffer
-    const dataBuffer: Buffer = (() => {
-      if (!Buffer.isBuffer(dataArg)) {
-        return Buffer.from(dataArg);
-      }
-      return dataArg;
-    })();
-    this.logStore = Buffer.concat([this.logStore, dataBuffer]);
+    const dataBuffer: Buffer = Buffer.isBuffer(dataArg) ? dataArg : Buffer.from(dataArg);
+    this.chunks.push(dataBuffer);
+    this.totalLength += dataBuffer.length;
   }
 
   public logAndAdd(dataArg: string | Buffer): void {