Release 6.0.0

Initial implementation of byjg/llm-api-objects

Strongly-typed PHP objects for building LLM API request payloads, compatible with OpenAI and Ollama (/v1 endpoint).

• Chat, Model, Message objects with toApi() serialization
• Full tools/function-calling support: Tool, ToolFunction, ToolParameter, ToolChoice
• Multi-turn tool conversations with role=tool and toolCallId
• All message roles: user, assistant, system, developer, tool
• Null content support for assistant messages with tool_calls
• Ollama model parameters via ModelFileParameters enum
• Jira XML/RSS importers for seeding conversation context
• PHPUnit test suite (40 tests) and Psalm static analysis
• GitHub Actions CI workflow
• Docusaurus documentation