Changes

PR #2020 by ksylvan: Add wire Debug Level for LLM Request/Response Logging

• Feat: add wire debug level (4) for full LLM request/response debug logging
• Add Wire log level constant to debug level enum and expose GetLevel() for safe concurrent level reads
• Log outbound message roles/content, inbound stream updates, token usage, and non-streaming LLM responses at wire debug level
• Update --debug flag description and set_debug_level locale strings across all 10 languages to include new level 4
• Update zsh, bash, and fish shell completions to include the new 4 (wire) debug level value