Fix MCP file discovery errors (#9)

* fix tool errors

*QA

mcp/server.ts

@@ -13,6 +13,7 @@ import {
   ReportProgressTool,
 } from "./comment.ts";
 import { DebugShellCommandTool } from "./debug.ts";
+import { ListFilesTool } from "./files.ts";
 import { CommitFilesTool, CreateBranchTool, PushBranchTool } from "./git.ts";
 import { IssueTool } from "./issue.ts";
 import { GetIssueCommentsTool } from "./issueComments.ts";
@@ -91,6 +92,7 @@ export async function startMcpHttpServer(
     CreateBranchTool(ctx),
     CommitFilesTool(ctx),
     PushBranchTool(ctx),
+    ListFilesTool,
   ];
 
   // only include ReportProgressTool if progress comment is not disabled