Honor canonical PR title forms

Authored-By: Codex (GPT-5) <noreply@openai.com>

check.sh

@@ -92,12 +92,6 @@ if echo "${TITLE}" | grep -qE "^\[bug-[a-z0-9]+\] ."; then
   TITLE_BUG=$(echo "${TITLE}" | sed -E 's|^\[(bug-[a-z0-9]+)\].*|\1|')
 fi
 
-PLAIN_TITLE=$(printf '%s\n' "${TITLE}" | sed -E 's/^\[bug-[a-z0-9]+\][[:space:]]+//')
-if printf '%s\n' "${PLAIN_TITLE}" | grep -qE '^(build|chore|ci|docs|feat|fix|perf|refactor|revert|style|test)(\([^)]*\))?!?:[[:space:]]'; then
-  echo "FAIL[check-naming]: title must be a plain-language imperative without Conventional Commit syntax"
-  FAILED=1
-fi
-
 if [ "${BRANCH_KIND}" = "role-bug" ]; then
   if [ -z "${TITLE_BUG}" ]; then
     echo "FAIL[check-naming]: title must lead with [${BRANCH_BUG}]"