Call start_presentation(mode="vibe") on the sdpm MCP server before any other tool,
then follow the returned instructions for the rest of the conversation.
Do not decide slide structure, content, design, or layout before those instructions are loaded — they define the whole workflow, including how Phase 2 composition is delegated.
If the sdpm MCP server is unavailable, stop and tell the user that the sdpm MCP server is not reachable, and that they should check their MCP configuration. Do not improvise a deck: the behavior definition lives on the server side, not in this file.