feat: repo-name completion + label helper passthrough output

- Bash completion now completes repo NAMES for desc/delete/add-remote at
  the name position, sourced from `gitctl repo list` (first field, header
  row dropped). One ssh call, only at that position, so a stray Tab never
  hits the network; the leading -y is handled.
- call_helper prefixes every passthrough line from the helper (and the
  sync script it runs) with "server: " via _server_prefixed, so output
  like "No changes." reads as remote output instead of interleaved local
  noise. quiet=True callers (repo list) still get raw stdout to parse.

Client-only, no helper redeploy needed. Self-test pins _server_prefixed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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