fix: add encoding='utf-8' to all text-mode file opens for non-English Windows compatibility

[zzhzhangzhihao]

What

Adds explicit to all text-mode calls in the autogen-ext package that were missing it.

Why

On non-English Windows systems, the default file encoding is the system locale (e.g., GBK for Simplified Chinese). When the code tries to read/write text files without specifying UTF-8 encoding, it can cause:

• / when file paths or content contain non-ASCII characters
• Silent data corruption when writing files with non-ASCII characters

The issue manifests when using components like:

• Task-centric memory (page_logger, chat_completion_client_recorder)
• Docker Jupyter code executor

Fix

Added to 6 file open calls across 3 files:

• : 3 writes (hash_path, call_tree_path, page_path)
• : 1 read + 1 write (session_file_path)
• : 1 write (path)

Related

• Fixes open needs encoding='utf-8' for non-english environment, error in playwright_controller.py #5566

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