Fix CI failure by ensuring e2e tests use main branch consistently

The macOS CI was failing because git init creates 'master' branch by default
but the test script was trying to push to 'main'. Added explicit branch
renaming to ensure consistent behavior across different git configurations.

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

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

Author: chrislloyd

src/e2e.sh

@@ -80,6 +80,7 @@ test_push() {
   git config user.name "Test User"
   git config user.email "test@example.com"
   git config commit.gpgsign false
+  git config init.defaultBranch main
 
   # Create a test file
   echo "# Test Repository" > README.md
@@ -88,6 +89,9 @@ test_push() {
   # Commit the file
   git add README.md
   git commit -m "Initial commit"
+  
+  # Ensure we're on main branch (rename master to main if needed)
+  git branch -M main
 
   # Add the database as a remote and push
   git remote add origin "sqlite://${TEST_DIR}/test.db"
@@ -114,6 +118,7 @@ test_clone() {
   git config user.name "Test User"
   git config user.email "test@example.com"
   git config commit.gpgsign false
+  git config init.defaultBranch main
 
   # Add the database as a remote and fetch
   git remote add origin "sqlite://${TEST_DIR}/test.db"