Mount implemented agents command at the top level

[codexwizardd]

The README documents sh1pt agents generate and related top-level agent commands, and packages/cli/src/commands/agents.ts implements list/setup/run/talk/generate. However, the root CLI currently exposes the generic adapter-category agents command instead, so documented commands like sh1pt agents generate are not available at the top level.\n\nThis issue tracks wiring the implemented agents command into the root CLI and avoiding the duplicate generic adapter-category command for agents.