bin/59665: There should be a "boot -r" option (or similar) to boot into /rescue

[thorpej%me.com@localhost]

>Number:         59665
>Category:       bin
>Synopsis:       There should be a "boot -r" option (or similar) to boot into /rescue
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 21 17:25:00 +0000 2025
>Originator:     Jason Thorpe
>Release:        NetBSD 11.99.2
>Organization:
RISCy Business
>Environment:
(doesn't matter)
>Description:
It would be nifty to have a "boot -r" option (or similar name) that booted into /rescue.  This would be useful in situations where the console cannot be used super early.

Recue boot should imply:
- Goes to single-user mode.
- Uses /rescue/init and /rescue/sh.

>How-To-Repeat:
N/A
>Fix:
Not provided.