Function parseBestEffortJson

Robust best-effort JSON parser for LLM-generated text (Gemini/other LLMs). Handles:

1. Full JSON (object or array)
2. Newline-delimited JSON
3. Adjacent JSON objects without newlines: {}{} Fallback: returns a normalized object with description and safety. Silently ignores unparseable fragments, but logs a warning once per parse.

DO NOT use for:

• config parsing
• API responses
• persistence
• security-sensitive data