Converts model configuration into Planck.AI.Model structs.

Two entry points are provided:

• load/1 — reads and parses a JSON file directly.
• from_list/1 — accepts an already-decoded list of maps, for callers (e.g. a CLI tool) that parse a larger config file themselves and extract only the models section before passing it here.

Each entry in the list maps to one %Planck.AI.Model{}. Only "id" and "provider" are required; all other fields have sensible defaults.

JSON format

[
  {
    "id": "my-local-llama",
    "provider": "llama_cpp",
    "name": "Local Llama 3.2",
    "base_url": "http://localhost:8080",
    "context_window": 32768,
    "max_tokens": 4096,
    "supports_thinking": false,
    "input_types": ["text"],
    "default_opts": {
      "temperature": 0.8,
      "top_p": 0.95,
      "top_k": 40
    }
  },
  {
    "id": "qwen3-coder:7b",
    "provider": "ollama",
    "context_window": 40960
  }
]

Loading from a file

{:ok, models} = Planck.AI.Config.load("config/models.json")

Loading from a pre-decoded list

# e.g. the CLI decoded a larger config and extracted the models section
models = Planck.AI.Config.from_list(decoded_config["models"])