fix: prevent duplicate workflow runs on PR branches

- Remove wildcard '**' from push trigger
- Push events now only trigger on main/master/develop branches
- PR events still trigger on all PRs to main/master/develop
- Prevents double runs when pushing to PR branches

.github/workflows/typecheck.yml

@@ -6,7 +6,6 @@ on:
       - main
       - master
       - develop
-      - '**'
   pull_request:
     branches:
       - main