refactor: use REPO_NAMES in configure_runners.sh

- Update validate_runner_repos() to check against words in REPO_NAMES
- Update repos hint builder to iterate REPO_NAMES

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

setup/configure_runners.sh

@@ -84,8 +84,12 @@ validate_runner_path() {
 
 validate_runner_repos() {
   if [[ "$1" == "all" ]]; then return 0; fi
-  # Check against known REPO_*_NAME values
-  [[ "$1" == "${REPO_1_NAME:-}" ]] || [[ "$1" == "${REPO_2_NAME:-}" ]] || [[ "$1" == "${REPO_3_NAME:-}" ]]
+  # Check against names in REPO_NAMES
+  local _rn
+  for _rn in ${REPO_NAMES:-}; do
+    [[ "$1" == "$_rn" ]] && return 0
+  done
+  return 1
 }
 
 validate_capacity() {
@@ -443,10 +447,9 @@ for ((i = 0; i < runner_count; i++)); do
   if [[ -z "$repos_default" ]]; then repos_default="all"; fi
   # Build hint with known repo names
   repos_hint="token scope: all"
-  for var in REPO_1_NAME REPO_2_NAME REPO_3_NAME; do
-    if [[ -n "${!var:-}" ]]; then
-      repos_hint="${repos_hint}, ${!var}"
-    fi
+  local _rn
+  for _rn in ${REPO_NAMES:-}; do
+    repos_hint="${repos_hint}, ${_rn}"
   done
   prompt_field "repos" "$repos_hint" "runner_repos" "$repos_default"
   save_runner_field "$r_name" "repos" "$PROMPT_RESULT"