fix: add encoding='utf-8' to open() calls for non-English environments (#5566)

[zlplzp123wyt]

Summary

Fixes UnicodeDecodeError when running AutoGen in CJK locales (cp939, cp950, gb2312, etc.) where the default system encoding cannot decode UTF-8 source files.

Fixes #5566

Changes

Added encoding="utf-8" to open() calls in text mode across 4 files:

• magentic_one_cli/_m1.py: Config file reading (2 locations)
• docker_jupyter/_docker_jupyter.py: Script file reading
• task_centric_memory/utils/page_logger.py: Log file operations (3 locations)
• task_centric_memory/utils/chat_completion_client_recorder.py: Cache file operations (2 locations)

Reproduction

On Windows with system locale set to Chinese (Traditional):

# Without encoding=utf-8, this raises UnicodeDecodeError
with open("utf8_file.js", "rt") as f:
    content = f.read()

Test Plan

• All modified files compile without syntax errors
• No binary file operations were modified
• Verified encoding parameter added to all text-mode open() calls

[zlplzp123wyt]

@microsoft-github-policy-service agree

[zlplzp123wyt]

Hi, this PR fixes encoding issues in calls for non-English environments. All CI checks pass. Would appreciate a review when time permits. Thank you!

[zlplzp123wyt]

Hi! This is a simple but important fix for non-English environments. Adding explicit encoding='utf-8' to open() calls prevents UnicodeDecodeError on systems where the default encoding isn't UTF-8. Ready for review whenever convenient. Thanks!