Run CI on all branches

Remove branch filters from GitHub Actions workflow so CI runs on
all pushes and pull requests, not just master.

https://claude.ai/code/session_01SUpZUWxrTYoGms6QN3VtQ9

Author: claude

.github/workflows/node.js.yml

@@ -5,9 +5,7 @@ name: Node.js CI
 
 on:
   push:
-    branches: [ master ]
   pull_request:
-    branches: [ master ]
 
 jobs:
   build:

CLAUDE.md

@@ -99,7 +99,7 @@ pnpm jest --updateSnapshot
 ## CI
 
 ### GitHub Actions (`.github/workflows/node.js.yml`)
-- Triggers on push to `master` and PRs targeting `master`
+- Triggers on all pushes and pull requests
 - Matrix: Node 20.x and 22.x
 - Uses `pnpm/action-setup@v4` for pnpm installation
 - Steps: `pnpm install` → `pnpm tsc` → `pnpm lint` → `pnpm jest`