Improve stdin/stdout encoding configuration for robust text handling

[assisted-by-ai]

Summary

Enhanced the stdin and stdout stream configuration to explicitly specify encoding, error handling, and newline behavior, improving robustness when processing untrusted input and ensuring consistent output formatting.

Key Changes

• stdin reconfiguration: Updated to explicitly set UTF-8 encoding with "replace" error handling strategy and Unix-style newlines, replacing the previous "ignore" error handling approach
• stdout reconfiguration: Added new explicit configuration to use ASCII encoding with "replace" error handling and Unix-style newlines before writing sanitized output

Implementation Details

These changes ensure:

• Invalid UTF-8 sequences in input are replaced with the Unicode replacement character rather than silently ignored
• Output is constrained to ASCII with invalid characters replaced, preventing encoding errors when writing sanitized strings
• Consistent newline handling across platforms (Unix-style \n)
• More predictable behavior when processing untrusted input with potential encoding issues

https://claude.ai/code/session_01CKA1A2XSprq49uNtGiMBxW

[ArrayBolt3]

Researched, decided the changes were good, accepted.in ArrayBolt3@47c6252.