docs: Document resolver repository and LLM-powered analyzer feature

[promptless]

Adds documentation for the resolver repository in the repos section. Documents that the resolver package detects and resolves documentation into Doc Detective tests, including its new AI-powered analyzer feature that can automatically extract action steps from plain documentation text. The analyzer supports multiple LLM providers (Anthropic, Google, OpenAI) and includes a local testing solution using llama.cpp.

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