fix: use nodejs/npm instead of bun for Claude CLI

Author: nikhilwoodruff

src/policyengine_api/agent_sandbox.py

@@ -6,22 +6,14 @@
 
 import modal
 
-# Sandbox image with Bun and Claude Code CLI
+# Sandbox image with Node.js and Claude Code CLI
 sandbox_image = (
     modal.Image.debian_slim(python_version="3.12")
-    .apt_install("curl", "git", "unzip")
+    .apt_install("curl", "git", "unzip", "nodejs", "npm")
     .pip_install("logfire")
     .run_commands(
-        # Install Bun
-        "curl -fsSL https://bun.sh/install | bash",
-        # Add bun to PATH and install Claude Code CLI globally
-        "export BUN_INSTALL=/root/.bun && export PATH=$BUN_INSTALL/bin:$PATH && bun install -g @anthropic-ai/claude-code",
-    )
-    .env(
-        {
-            "BUN_INSTALL": "/root/.bun",
-            "PATH": "/root/.bun/bin:/usr/local/bin:/usr/bin:/bin",
-        }
+        # Install Claude Code CLI globally via npm
+        "npm install -g @anthropic-ai/claude-code",
     )
 )