LangChain OpenRouter integration adds parallel_tool_calls support

Full analysis

LangChain released langchain-openrouter 0.2.4, with the most agent-relevant change being the surfacing of parallel_tool_calls on the bind_tools API — allowing agent pipelines to instruct models to call multiple tools simultaneously in a single turn. The release also adds test coverage for cache_control passthrough on tool definitions, bumps the OpenRouter dependency floor to 0.9.2, and drops a prior file-handling workaround. The bulk of commits are routine model-profile data refreshes with no agent-capability impact.