v1.11.1

Fixed

• An inline --flag=value keeps every = after the first. --url=https://host/mcp?a=b
  used to become https://host/mcp?a, and --filter=a=b was sent as filter=a.
  Ported from public contributor PR #21 by
  @hey-research-lab.
• An unreadable config file (for example root-owned after
  sudo cambrian config set-key) is no longer treated as "no stored key".
  cambrian config status and commands that need the stored key now name the
  file and the error (such as EACCES) and exit 1. A missing file or invalid
  JSON still counts as an empty config. The update check,
  cambrian schema refresh, and the /evm/chains name lookup do not need the
  stored key, so they still work.