Add explicit UTF-8 encoding to file operations in autogen-ext

[alpnix]

Summary

Fixes #5566 by adding encoding='utf-8' parameter to text-mode file operations that were missing it in the autogen-ext package. This prevents UnicodeDecodeError on Windows systems with non-English system locales.

Problem

The codebase had multiple open() calls without explicit UTF-8 encoding, causing crashes on Windows with non-English locales (Chinese, Japanese, etc.). While one instance was previously fixed in playwright_controller.py, several others remained throughout the codebase.

Changes

Added encoding="utf-8" to 6 file operations across 3 files:

1. code_executors/docker_jupyter/_docker_jupyter.py

• Line 278: HTML file writing in _save_html method

2. experimental/task_centric_memory/utils/page_logger.py

• Line 120: Hash file writing
• Line 389: Call tree HTML writing
• Line 501: Page HTML writing

3. experimental/task_centric_memory/utils/chat_completion_client_recorder.py

• Line 76: JSON session file reading
• Line 214: JSON session file writing

Testing

• ✅ All changes are mechanical additions of the encoding parameter
• ✅ No functional changes to code logic
• ✅ Follows Python 3 best practices (PEP 597)
• ✅ Syntax validated

Impact

High - Prevents crashes for international users on Windows systems with non-English locales, improving cross-platform compatibility.

Diff Summary

 3 files changed, 6 insertions(+), 6 deletions(-)

All changes follow the same pattern:

# Before
with open(path, "w") as f:

# After  
with open(path, "w", encoding="utf-8") as f:

Closes #5566

[alpnix]

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