fix: remove stray 'local' in main loop causing crash loop

The 'local' keyword on line 525 was outside any function (in the main
while-true loop), causing bash to exit with 'local: can only be used in
a function'. This prevented the service from reaching the poll cycle,
so new PR reviews (like PRR 4028914289) were never picked up.

Remove the 'local' keyword — pr_author is a plain variable in the
top-level script scope.

Co-authored-by: Shelley <shelley@exe.dev>

Author: smol-squad

modules/gh-pm/bin/gh-pm

@@ -522,7 +522,6 @@ while true; do
     pr_count="$(echo "$prs_json" | jq 'length')"
     for (( i=0; i<pr_count; i++ )); do
       item="$(echo "$prs_json" | jq ".[$i]")"
-      local pr_author
       pr_author="$(echo "$item" | jq -r '.author.login // ""')"
       if [[ "$pr_author" == "$GH_PM_USER" ]]; then
         # Authored PR — check for review feedback and CI failures