chore(telemetry): align shell_exec and dev_server_start cwd to flattened workspace root

vibn-frontend/app/api/mcp/route.ts

@@ -4508,10 +4508,7 @@ async function toolShellExec(
     const result = await execInDevContainer({
       projectId: project.id,
       command,
-      cwd:
-        typeof params.cwd === "string"
-          ? params.cwd
-          : `/workspace/${project.slug}`,
+      cwd: typeof params.cwd === "string" ? params.cwd : "/workspace",
       timeoutMs: Number.isFinite(Number(params.timeoutMs))
         ? Number(params.timeoutMs)
         : Number.isFinite(Number(params.timeout_ms))

vibn-frontend/lib/dev-container.ts

@@ -908,7 +908,7 @@ export async function startDevServer(
 
   const launch =
     `mkdir -p /var/log/vibn-dev && ` +
-    `cd /workspace/${opts.projectSlug} && ` +
+    `cd /workspace && ` +
     `nohup env PORT=${opts.port} VIBN_DEV_SERVER_ID=${id} ` +
     `bash -lc ${shellEscape(listenSafeCommand)} > ${logFile} 2>&1 & ` +
     `echo $!`;