Enable CI for all branches

Remove branch restrictions from GitHub Actions CI to ensure
all branches get tested automatically on push and PR.

This ensures development branches are properly validated
before merging.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: hitode909

.github/workflows/ci.yml

@@ -5,9 +5,6 @@ name: CI
 on:
   pull_request:
   push:
-    branches:
-      - master
-      - 2025
 
 jobs:
   test: