chore: limit scope of commit messages to dozen characters

CONTRIBUTING.md

@@ -105,6 +105,9 @@ The scope could be anything specifying place of the commit change. For example
 `$location`, `$browser`, `$compile`, `$rootScope`, `ngHref`, `ngClick`,
 `ngView`, etc.
 
+Since people were abusing length of the scope, it's limited to 12 characters.
+If you're running into the limit, you're doing it wrong.
+
 #### Subject
 The subject contains succinct description of the change:
 

verify-commit-messages.sh

@@ -31,7 +31,7 @@ echo "" # ← formatting
 
 # Conform, /OR ELSE/.
 if git log --format=format:'%s' "$ARG" | \
-    grep -v -E '^((feat|fix|docs|style|refactor|perf|revert|test|chore)(\(.+\))?:.{1,68})|(Merge pull request #[[:digit:]]{1,10})$'
+    grep -v -E '^((feat|fix|docs|style|refactor|perf|revert|test|chore)(\(.{,12}\))?:.{1,68})|(Merge pull request #[[:digit:]]{1,10})$'
 then
     echo ""
     echo "Above ↑ commits don't conform to commit message format:"