fix: name a repository the forge renamed

GitHub, GitLab and Gitea redirect a renamed repository, and every call
follows the redirect: AloysHF/NicaiEmu answers as AloysHF/CoolbarEmu
and the profile read as current. profile_sync now reads the name the
forge answers under and counts a move as review work.

scripts/upstream.py

@@ -455,6 +455,25 @@ def _first_sha(payload: object) -> str | None:
     return None
 
 
+def current_slug(repo: Repo, cache_dir: str, offline: bool = False) -> str | None:
+    """The owner/name the forge answers for a repository today.
+
+    A renamed or transferred repository keeps answering under its old name:
+    GitHub redirects (AloysHF/NicaiEmu answers as AloysHF/CoolbarEmu), GitLab
+    and Gitea do the same. Every later call follows the redirect, so only the
+    name in the payload tells the project moved.
+    """
+    if repo.family == "gitlab":
+        url, key = f"{repo.api_base}/projects/{_project(repo)}", "path_with_namespace"
+    else:
+        url, key = f"{repo.api_base}/repos/{repo.slug}", "full_name"
+    payload = _api(url, cache_dir, offline, MOVING_TTL)
+    if not isinstance(payload, dict):
+        return None
+    value = payload.get(key)
+    return str(value) if value else None
+
+
 def resolve_head(
     repo: Repo, cache_dir: str, offline: bool = False, branch: str | None = None
 ) -> str | None: