fix(mcp): return correct lines on typescript errors

Author: stainless-app[bot]

.devcontainer/Dockerfile

@@ -0,0 +1,23 @@
+# syntax=docker/dockerfile:1
+FROM debian:bookworm-slim AS stainless
+
+RUN apt-get update && apt-get install -y \
+  nodejs \
+  npm \
+  yarnpkg \
+  && apt-get clean autoclean
+
+# Ensure UTF-8 encoding
+ENV LANG=C.UTF-8
+ENV LC_ALL=C.UTF-8
+
+# Yarn
+RUN ln -sf /usr/bin/yarnpkg /usr/bin/yarn
+
+WORKDIR /workspace
+
+COPY package.json yarn.lock /workspace/
+
+RUN yarn install
+
+COPY . /workspace