fixed git-worktree-create branch creation

.opencode/tools/git-worktree-create.ts

@@ -5,11 +5,9 @@ export default tool({
   description: "Create a git worktree for a branch or PR",
   args: {
     branch: tool.schema.string().describe("Branch name or PR number"),
-    directory: tool.schema.string().describe("Worktree directory name (optional)"),
   },
   async execute(args) {
-    const worktreeDir = args.directory || args.branch
-    const result = await $`git worktree add ../worktrees/${worktreeDir} ${args.branch}`.text()
+    const result = await $`git worktree add ../worktrees/${args.branch}`.text()
     return result.trim()
   },
 })