fix: auth-decisions (follow gh: auth status exit code and GITEA_TOKEN account)

Signed-off-by: bircni <bircni@icloud.com>

docs/migration-1.0.md

@@ -400,7 +400,8 @@ archive, or run `make docs`.
 - `config get KEY` prints only the value; `--show-source` adds where it comes
   from.
 - `auth status` exits with 4 when there is no account or a credential is
-  missing or rejected. `auth token` prints the active account's token.
+  missing or rejected; with `--json` it exits 0 and reports the problem in the
+  output (`credential_available`, `verified`, `error`), like `gh auth status --json`. `auth token` prints the active account's token.
 - `webhook edit` must be told what to do with the delivery authorization header
   on every call, because Gitea replaces it: pass `--authorization-header`,
   `--authorization-header-file` or `--clear-authorization`. The signing secret