Expose documented top-level deploy command

[codexwizardd]

README references sh1pt deploy for cloud infrastructure workflows, but the deploy command is currently mounted only under sh1pt scale deploy.

A top-level deploy alias would make the documented command discoverable while keeping sh1pt scale deploy available for the nested scale workflow.

Proposed fix:

• allow deploy command creation through a factory so Commander instances are not reused across parents
• mount one deploy command at the root and keep the existing one under scale
• verify package-local CLI typecheck and build