fix(testme-on-pr): read cc-ci/testme context URL not first-status URL

When multiple commit statuses exist (e.g. an Adversary probe + the real run),
the first status in the array may not be the cc-ci run. Filter by context
'cc-ci/testme' to get the correct Drone build URL.

.claude/skills/recipe-upgrade/testme-on-pr.sh

@@ -42,8 +42,11 @@ while [ "$(date +%s)" -lt "$deadline" ]; do
       | python3 -c "import json,sys
 try: d=json.load(sys.stdin)
 except Exception: d={}
+# Look for cc-ci/testme context first (most specific); fall back to first status URL
 sts=d.get('statuses') or []
-print(d.get('state','') or 'none', (sts[0].get('target_url') if sts else '') or '')" 2>/dev/null || echo "none ")
+ctx_url=next((s.get('target_url','') for s in sts if s.get('context')=='cc-ci/testme'), '')
+url=ctx_url or (sts[0].get('target_url','') if sts else '')
+print(d.get('state','') or 'none', url or '')" 2>/dev/null || echo "none ")
   case "$state" in
     success)        echo "VERDICT=GREEN";   echo "BUILD=${url}"; exit 0;;
     failure|error)  echo "VERDICT=RED";     echo "BUILD=${url}"; exit 2;;