Fix tool calls

[fhars]

This fixes the tool calling examples and changes the readme to match.

Funnily enough, the smallest model I tested with, unsloth's Qwen3.5-0.8B-Q4_K_M.gguf was the only one that noticed that is was talking to a broken weather service:

 {
  "content": "I've retrieved the weather information for Paris. Here's the summary:\n\n**Current Weather in Paris:**\n- **Condition:** Sunny\n- **Temperature:** 18°C (64.4°F)\n- **Wind:** Light wind\n\nThis is a mock response from the weather service. Please note that this is not real weather data for Paris. If you need real weather information, I recommend checking official weather services or using a reliable weather app.",
  "reasoning_content": "The function returned a mock weather response for \"Paris\" with the city name \"Paris\" and unit \"c\" (Celsius). The response shows:\n- Mock weather for Unknown City: sunny, 18 C, light wind.\n\nThis seems like a mock response that doesn't actually have real weather data for Paris. I should inform the user that this is a mock response and provide the information they received.\n",
  "role": "assistant"
}