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>

1 files changed, 14 insertions, 0 deletions

diff --git a/completions/gitctl.bash b/completions/gitctl.bash
index 929346d..321a917 100644
--- a/completions/gitctl.bash
+++ b/completions/gitctl.bash
@@ -29,6 +29,20 @@ _gitctl() {
         return
     fi
 
+    # complete repo names for the name argument of desc/delete/add-remote (one
+    # ssh call). Only at the name position and not while typing a flag, so a
+    # stray Tab elsewhere never hits the network. `repo list` prints an aligned
+    # table (no color when not a TTY, as here); the name is the first field, and
+    # we drop the NAME header row.
+    if [[ $cword -eq 3 && $group == repo && $cur != -* \
+          && ( $action == desc || $action == delete || $action == add-remote ) ]]; then
+        local repos
+        repos=$(gitctl repo list 2>/dev/null | awk 'NR>1 {print $1}')
+        local IFS=$'\n'
+        COMPREPLY=($(compgen -W "$repos" -- "$cur"))
+        return
+    fi
+
     case $cword in
         1)
             COMPREPLY=($(compgen -W "-y --yes sections sync repo" -- "$cur"))