Adding --depth=1 to fetchs to save time

See https://github.com/anthropics/claude-code-action/issues/52

src/github/operations/branch.ts

@@ -52,7 +52,7 @@ export async function setupBranch(
       );
 
       // Check out the base branch and let Claude create branches as needed
-      await $`git fetch origin ${sourceBranch}`;
+      await $`git fetch origin --depth=1 ${sourceBranch}`;
       await $`git checkout ${sourceBranch}`;
       await $`git pull origin ${sourceBranch}`;
 
@@ -99,7 +99,7 @@ export async function setupBranch(
 
     // Ensure we have the latest version of the source branch
     console.log(`Fetching latest ${sourceBranch}...`);
-    await $`git fetch origin ${sourceBranch}`;
+    await $`git fetch origin --depth=1 ${sourceBranch}`;
 
     // Checkout the source branch
     console.log(`Checking out ${sourceBranch}...`);

src/github/utils/local-git.ts

@@ -85,7 +85,7 @@ export async function branchHasChanges(
  */
 export async function fetchBranch(branchName: string): Promise<boolean> {
   try {
-    await $`git fetch origin ${branchName}`;
+    await $`git fetch origin --depth=1 ${branchName}`;
     return true;
   } catch (error) {
     console.log(