v0.4.0

Changed

• Improve MCP auth failure handling.
• Standardize usage reporting.
• Clearer split between remote/local command handling
• Split the machine caller into an API key caller and an admin caller.

Added

• CLI run works against a remote server
• Slackbot prompts for MCP reauth by default. Overrideable in config.
• Engine driven deferred tool definition support.
• Calls to Anthropic, OpenAI, and OpenRouter now cache the prompt.
• Streamed calls now report their token counts, and the cached part of the prompt.
• Support cache_ttl on llm config blocks in the manifest.