Switch to Bun runtime for Claude Code

Claude Code is optimized for Bun, use Bun instead of Node.js

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20-alpine
+FROM oven/bun:1.3.6-alpine
 
 # Install system dependencies
 RUN apk add --no-cache \
@@ -8,13 +8,11 @@ RUN apk add --no-cache \
     openssh-client \
     ca-certificates
 
-# Install Claude Code CLI
-RUN npm install -g @anthropic-ai/claude-code
+# Install Claude Code CLI with Bun
+RUN bun install -g @anthropic-ai/claude-code
 
-# Install common development tools
-RUN npm install -g \
-    typescript \
-    ts-node
+# Install common development tools with Bun
+RUN bun install -g typescript
 
 # Create workspace directory
 WORKDIR /workspace