Method processStreamData

container/process-monitor.ts:759–794

* Fix H1: Process stream data with proper line buffering * Handles incomplete lines that span multiple data chunks and * multi-byte UTF-8 characters that might be split across chunks

(data: Buffer, stream: 'stdout' | 'stderr')

   * multi-byte UTF-8 characters that might be split across chunks
   */
  private processStreamData(data: Buffer, stream: 'stdout' | 'stderr'): void {
    // Use StringDecoder to properly handle multi-byte UTF-8 characters
    const decoder = stream === 'stdout' ? this.stdoutDecoder : this.stderrDecoder;
    const bufferKey = stream === 'stdout' ? 'stdoutBuffer' : 'stderrBuffer';

    // Decode buffer (handles partial UTF-8 sequences correctly)
    const decoded = decoder.write(data);

    // Combine with any incomplete line from previous chunk
    const content = this[bufferKey] + decoded;
    const lines = content.split('\n');

    this.lastActivity = new Date();

    // The last element might be incomplete - save for next chunk
    this[bufferKey] = lines.pop() || '';

    // Process complete lines
    for (const line of lines) {
      const trimmedLine = line.trim();
      if (!trimmedLine) continue;

      this.simpleLogManager.appendLog(trimmedLine, stream).catch(() => {});

      const logLine: LogLine = {
        content: trimmedLine,
        timestamp: new Date(),
        stream,
        processId: this.processInfo.id
      };
      // CircularBuffer automatically handles capacity - O(1) push
      this.logBuffer.push(logLine);

      this.parseJsonLog(trimmedLine);
    }
  }

  private parseJsonLog(line: string): void {
    try {