CLI `add-redirect` doesn't conform to other command conventions

Summary

Most of the CLI commands use slugs as paths with an optional locale (defaulting to en-US), e.g.:

yarn content move Learn/Accessibility Learn/A11y
yarn content delete <document-slug> [locale] --redirect <redirect-slug-or-url>

The add-redirect expects absolute URLs:

yarn content add-redirect "https://developer.mozilla.org/en-US/docs/Learn" \
"https://developer.mozilla.org/en-US/docs/Web/API/URL/URL\#examples"
# ...
info: Saved '/en-US/docs/Learn' → '/en-US/docs/Web/API/URL/URL/'

yarn content add-redirect "https://developer.mozilla.org/en-US/docs/not/existing/page" \
"https://developer.mozilla.org/en-US/docs/Web/API/URL/URL\#examples"
# ...
info: Saved '/en-US/docs/not/existing/page' → '/en-US/docs/Web/API/URL/URL/'

It might be consistent to behave like this:

yarn content add-redirect <document-slug> [locale] <redirect-slug-or-url>

URL

https://github.com/mdn/content/pull/27913

Reproduction steps

Run example command:

yarn content add-redirect Learn Web/API/URL/URL

Expected behavior

A redirect is added, i.e.:

info: Saved '/en-US/docs/Learn' → '/en-US/docs/Web/API/URL/URL/'

Actual behavior

invalid URL error

Device

Desktop

Browser

Firefox

Browser version

Stable

Operating system

Mac OS

Screenshot

No response

Anything else?

Is there something we're overlooking why it's necessary to use absolute URLs like this?

Suggestion from Josh:

The fix is trivial: just add "https://developer.mozilla.org/en-US/docs" as the base, so that /en-US/docs/Web/API/URL/URL, Web/API/URL/URL, and https://developer.mozilla.org/en-US/docs/Web/API/URL/URL will all work.

Validations

• I have read the Community Participation Guidelines.
• I have verified that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• I have checked that this is a concrete bug. For Q&A open a GitHub Discussion.

Start at the CLI entry point for the content add-redirect command and reproduce the documented slug-based invocation. The change is complete when document slugs, optional locales, paths, and absolute URLs are accepted consistently and the command reports the expected saved redirect.