urlparse raises ValueError on e.g. an unbalanced IPv6 literal before the
invalid-URL branch is reached; on workflow update that also bypassed the
per-workflow handler and aborted the whole command. Convert the parse
failure into a clean error so add fails cleanly and update skips just the
affected workflow.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>