Added provider-specific reasoning/thinking token support for:
- OpenAI (o1, o3, gpt-5): Full reasoning events via Responses API, token counts via Chat Completions
- Groq: reasoning_format:"parsed" for Chat Completions, no summary support for Responses
- Gemini 2.5: extra_body.google.thinking_config with <thought> tag extraction
- OpenRouter: Unified reasoning parameter with message.reasoning field
- Anthropic: Limited support via OpenAI compatibility layer
Key improvements:
- Centralized provider detection based on baseURL
- parseReasoningFromMessage() extracts provider-specific reasoning content
- adjustRequestForProvider() handles provider-specific request modifications
- Smart reasoning support detection with caching per API type
- Comprehensive README documentation with provider support matrix
Fixes reasoning tokens not appearing for GPT-5 and other reasoning models.
- Show tool call count alongside token metrics in TUI and console renderers
- TUI: Display at bottom with format "↑X ↓Y ⚒Z"
- Console: Show metrics after assistant messages complete
- Counter increments on each tool_call event
