Summary

• Subcommand runtime usage errors (e.g., npm stage approve without a <stage-id>) rendered the bare subcommand name (e.g., npm approve <stage-id>) and Run "npm help approve" for more info -- pointing at a command and help page that don't exist.
• The subcommand instance now carries its parent command name, so usage output and usageError render the full path (npm stage approve <stage-id>) and point to the real help page (npm help stage)

This fix applies to npm stage and npm trust.

Implementation

• lib/npm.js: set parentName on the subcommand instance during dispatch (and use the full joined path on the --help branch for parity).
• lib/base-cmd.js: the instance usage getter threads parentName into getUsage, and the help footer resolves to the top-level documented command.

References

Fixes #9403