Fixing issue where LLM's sometimes choose to pass a json array of model names

[JKapostins]

• Add parse_json_array_parameter() helper function to handle JSON array parsing
• Fix issue where LLMs sometimes pass JSON arrays as strings instead of parsed arrays
• Apply fix to all existing MCP tools with models_prefixed_by_provider parameter:
  • PROMPT
  • PROMPT_FROM_FILE
  • PROMPT_FROM_FILE_TO_FILE
  • CEO_AND_BOARD
• Gracefully handles both properly parsed arrays and JSON string arrays
• Prevents errors when LLMs pass ["model1", "model2"] as string instead of array

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