Fix CI/E2E workflows to only run on main branch pushes

Changes:
- CI and E2E workflows now only trigger on push to main branch
- Claude/* feature branches tested via pull requests only
- Saves CI minutes and prevents redundant workflow runs
- Consistent trigger pattern across all workflows

Workflow triggers:
- Push to main: ✓ (production validation)
- Pull requests to main: ✓ (feature testing)
- Push to claude/*: ✗ (tested via PR instead)

Author: claude

.github/workflows/ci.yml

@@ -2,9 +2,11 @@ name: CI
 
 on:
   push:
-    branches: [ main, claude/* ]
+    branches:
+      - main
   pull_request:
-    branches: [ main ]
+    branches:
+      - main
 
 jobs:
   format:

.github/workflows/e2e.yml

@@ -2,9 +2,11 @@ name: E2E Tests
 
 on:
   push:
-    branches: [ main, claude/* ]
+    branches:
+      - main
   pull_request:
-    branches: [ main ]
+    branches:
+      - main
 
 jobs:
   playwright: