feat: add Kode-Agent to base sandbox image

Install Kode (@shareai-lab/kode@2.2.0) in the base sandbox image and
add its network policy. Kode is an open-source multi-model AI coding
agent supporting both Anthropic and OpenAI APIs.

Changes:
- Dockerfile: add @shareai-lab/kode@2.2.0 to global npm packages
- policy.yaml: add kode_agent network policy (api.anthropic.com,
  api.openai.com) and grant kode binary access to GitHub REST API

Author: CrazyBoyM

sandboxes/base/Dockerfile

@@ -74,7 +74,8 @@ RUN npm install -g \
         tar@7.5.11 \
         @hono/node-server@1.19.11 \
         opencode-ai@1.2.18 \
-        @openai/codex@0.111.0
+        @openai/codex@0.111.0 \
+        @shareai-lab/kode@2.2.0
 
 # GitHub CLI
 RUN curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg \

sandboxes/base/policy.yaml

@@ -93,6 +93,7 @@ network_policies:
         access: read-only
     binaries:
       - { path: /usr/local/bin/claude }
+      - { path: /usr/local/bin/kode }
       - { path: /usr/bin/gh }
 
   pypi:
@@ -159,3 +160,12 @@ network_policies:
     - path: /usr/lib/node_modules/opencode-ai/bin/.opencode
     - path: /usr/bin/node
     - path: /usr/local/bin/opencode
+
+  kode_agent:
+    name: kode-agent
+    endpoints:
+      - { host: api.anthropic.com, port: 443, protocol: rest, enforcement: enforce, access: full, tls: terminate }
+      - { host: api.openai.com, port: 443 }
+    binaries:
+      - { path: /usr/local/bin/kode }
+      - { path: /usr/bin/node }