Registers the nexus://models resource with the MCP server.
Exposes the full model capabilities matrix (13 models) as a
read-only JSON resource. Data is sourced from the canonical
model registry (via getInTreeCapabilitiesMatrix() — backed by
the ModelRegistry's in-tree entries, #2546 slice C3).
MCP server instance
Logger for registration events
MCP exports - MCP server implementation Split from index.ts for file size compliance (Issue #285) Updated Issue #538: Added missing tool registration exports