Evalt 0.9.5

Evalt 0.9.5 makes the tested OpenRouter Chat Completions request envelope part of each durable route. Structured output, tools, sampling controls, provider routing, plugins, multimodal message content, and future JSON request fields now run under the same settings during evaluation and production. Overrides emit a typed warning and lose the saved quality claim; strict mode stops them before provider spend. Tool-call-only responses are preserved as structured results.