LLMCostTracker 0.15.0: per-run budgets for agents, RubyLLM 2.1, more providers

LLMCostTracker records the LLM calls your Rails app makes through RubyLLM, the official OpenAI and Anthropic SDKs or Faraday into your own database: priced per call, tagged by user, feature or any tag, with budgets and a dashboard. No proxy, no prompts stored.