fix(container): bump Claude Code to 2.1.116 and Agent SDK to ^0.2.116

The Agent SDK's IPC protocol must match the Claude Code version. Also
allowlist @anthropic-ai/claude-code in only-built-dependencies so its
postinstall script runs during Docker build — without this, the native
binary is never installed and the SDK fails at spawn time.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

container/Dockerfile

@@ -15,7 +15,7 @@ ARG INSTALL_CJK_FONTS=false
 # Pin CLI versions for reproducibility. Bump deliberately — unpinned installs
 # mean every rebuild silently picks up the latest and can break in lockstep
 # across all users.
-ARG CLAUDE_CODE_VERSION=2.1.112
+ARG CLAUDE_CODE_VERSION=2.1.116
 ARG AGENT_BROWSER_VERSION=latest
 ARG VERCEL_VERSION=latest
 ARG BUN_VERSION=1.3.12
@@ -76,6 +76,7 @@ RUN corepack enable
 # package. Pinned versions so every rebuild is reproducible.
 RUN --mount=type=cache,target=/root/.cache/pnpm \
     echo "only-built-dependencies[]=agent-browser" > /root/.npmrc && \
+    echo "only-built-dependencies[]=@anthropic-ai/claude-code" >> /root/.npmrc && \
     pnpm install -g \
         "@anthropic-ai/claude-code@${CLAUDE_CODE_VERSION}" \
         "agent-browser@${AGENT_BROWSER_VERSION}" \