feat: add Gemini CLI support

sandboxes/gemini/Dockerfile

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+# syntax=docker/dockerfile:1.4
+
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+# Gemini CLI sandbox image for OpenShell
+#
+# Builds on the community base sandbox and adds Google Gemini CLI.
+# Build:  docker build -t openshell-gemini --build-arg BASE_IMAGE=openshell-base .
+# Run:    openshell sandbox create --from gemini
+
+ARG BASE_IMAGE=ghcr.io/nvidia/openshell-community/sandboxes/base:latest
+FROM ${BASE_IMAGE}
+
+USER root
+
+# Install Gemini CLI (pinned for reproducibility)
+RUN npm install -g @google/gemini-cli@0.35.0
+
+# Copy sandbox policy
+COPY policy.yaml /etc/openshell/policy.yaml
+
+# Create Gemini config directory
+RUN mkdir -p /sandbox/.gemini && \
+    chown sandbox:sandbox /sandbox/.gemini
+
+USER sandbox
+
+ENTRYPOINT ["/bin/bash"]

sandboxes/gemini/README.md

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+# Gemini CLI Sandbox
+
+OpenShell sandbox image pre-configured with [Gemini CLI](https://github.com/google-gemini/gemini-cli) for Google AI-powered coding assistance.
+
+## What's Included
+
+- **Gemini CLI** (`@google/gemini-cli@0.35.0`) — Google Gemini AI coding agent
+- Everything from the [base sandbox](../base/README.md)
+
+## Build
+
+```bash
+docker build -t openshell-gemini .
+```
+
+To build against a specific base image:
+
+```bash
+docker build -t openshell-gemini --build-arg BASE_IMAGE=ghcr.io/nvidia/openshell-community/sandboxes/base:latest .
+```
+
+## Usage
+
+### Create a sandbox
+
+```bash
+openshell sandbox create --from gemini
+```

sandboxes/gemini/policy.yaml

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+# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+version: 1
+
+# --- Sandbox setup configuration (queried once at startup) ---
+
+filesystem_policy:
+  include_workdir: true
+  read_only:
+    - /usr
+    - /lib
+    - /proc
+    - /dev/urandom
+    - /app
+    - /etc
+    - /var/log
+  read_write:
+    - /sandbox
+    - /tmp
+    - /dev/null
+
+landlock:
+  compatibility: best_effort
+
+process:
+  run_as_user: sandbox
+  run_as_group: sandbox
+
+# --- Network policies (queried per-CONNECT request) ---
+#
+# Each named policy maps a set of allowed (binary, endpoint) pairs.
+# Binary identity is resolved via /proc/net/tcp inode lookup + /proc/{pid}/exe.
+# Ancestors (/proc/{pid}/status PPid walk) and cmdline paths are also matched.
+# SHA256 integrity is enforced in Rust via trust-on-first-use, not here.
+
+network_policies:
+  claude_code:
+    name: claude-code
+    endpoints:
+      - {
+          host: api.anthropic.com,
+          port: 443,
+          protocol: rest,
+          enforcement: enforce,
+          access: full,
+          tls: terminate,
+        }
+      - { host: statsig.anthropic.com, port: 443 }
+      - { host: sentry.io, port: 443 }
+      - { host: raw.githubusercontent.com, port: 443 }
+      - { host: platform.claude.com, port: 443 }
+    binaries:
+      - { path: /usr/local/bin/claude }
+      - { path: /usr/bin/node }
+
+  github_ssh_over_https:
+    name: github-ssh-over-https
+    endpoints:
+      - host: github.com
+        port: 443
+        protocol: rest
+        tls: terminate
+        enforcement: enforce
+        rules:
+          # Git Smart HTTP read-only: allow clone, fetch, pull
+          # Discovery (query string is included in path matching)
+          - allow:
+              method: GET
+              path: "/**/info/refs*"
+          # Data transfer for reads (all repos)
+          - allow:
+              method: POST
+              path: "/**/git-upload-pack"
+          # Data transfer for writes
+          # - allow:
+          #    method: POST
+          #    path: "/**/git-receive-pack"
+    binaries:
+      - { path: /usr/bin/git }
+
+  nvidia_inference:
+    name: nvidia-inference
+    endpoints:
+      - { host: integrate.api.nvidia.com, port: 443 }
+    binaries:
+      - { path: /usr/bin/curl }
+      - { path: /bin/bash }
+      - { path: /usr/local/bin/opencode }
+
+  # --- GitHub REST API (read-only) ---
+  github_rest_api:
+    name: github-rest-api
+    endpoints:
+      - host: api.github.com
+        port: 443
+        protocol: rest
+        tls: terminate
+        enforcement: enforce
+        access: read-only
+    binaries:
+      - { path: /usr/local/bin/claude }
+      - { path: /usr/bin/gh }
+
+  pypi:
+    name: pypi
+    endpoints:
+      - { host: pypi.org, port: 443 }
+      - { host: files.pythonhosted.org, port: 443 }
+      # uv python install downloads from python-build-standalone on GitHub
+      - { host: github.com, port: 443 }
+      - { host: objects.githubusercontent.com, port: 443 }
+      # uv resolves python-build-standalone release metadata via the GitHub API
+      - { host: api.github.com, port: 443 }
+      - { host: downloads.python.org, port: 443 }
+    binaries:
+      - { path: /sandbox/.venv/bin/python }
+      - { path: /sandbox/.venv/bin/python3 }
+      - { path: /sandbox/.venv/bin/pip }
+      - { path: /app/.venv/bin/python }
+      - { path: /app/.venv/bin/python3 }
+      - { path: /app/.venv/bin/pip }
+      - { path: /usr/local/bin/uv }
+      # Managed Python installations from uv python install
+      - { path: "/sandbox/.uv/python/**" }
+
+  vscode:
+    name: vscode
+    endpoints:
+      - { host: update.code.visualstudio.com, port: 443 }
+      # NOTE: OPA host matching uses exact equality, not glob — list hosts explicitly.
+      - { host: az764295.vo.msecnd.net, port: 443 }
+      - { host: vscode.download.prss.microsoft.com, port: 443 }
+      - { host: marketplace.visualstudio.com, port: 443 }
+      - { host: gallerycdn.vsassets.io, port: 443 }
+    binaries:
+      - { path: /usr/bin/curl }
+      - { path: /usr/bin/wget }
+      - { path: "/sandbox/.vscode-server/**" }
+      - { path: "/sandbox/.vscode-remote-containers/**" }
+
+  cursor:
+    name: cursor
+    endpoints:
+      - { host: cursor.blob.core.windows.net, port: 443 }
+      # NOTE: OPA host matching uses exact equality, not glob — list hosts explicitly.
+      - { host: api2.cursor.sh, port: 443 }
+      - { host: repo.cursor.sh, port: 443 }
+      - { host: download.cursor.sh, port: 443 }
+      - { host: cursor.download.prss.microsoft.com, port: 443 }
+    binaries:
+      - { path: /usr/bin/curl }
+      - { path: /usr/bin/wget }
+      - { path: "/sandbox/.cursor-server/**" }
+
+  opencode:
+    name: opencode
+    endpoints:
+      - host: registry.npmjs.org
+        port: 443
+      - host: opencode.ai
+        port: 443
+      - host: integrate.api.nvidia.com
+        port: 443
+    binaries:
+      - path: /usr/lib/node_modules/opencode-ai/bin/.opencode
+      - path: /usr/bin/node
+      - path: /usr/local/bin/opencode
+
+  copilot:
+    name: copilot
+    endpoints:
+      - { host: github.com, port: 443 }
+      - { host: api.github.com, port: 443 }
+      - { host: api.githubcopilot.com, port: 443 }
+      - { host: api.enterprise.githubcopilot.com, port: 443 }
+      - { host: release-assets.githubusercontent.com, port: 443 }
+      - { host: copilot-proxy.githubusercontent.com, port: 443 }
+      - { host: default.exp-tas.com, port: 443 }
+    binaries:
+      - {
+          path: /usr/lib/node_modules/@github/copilot/node_modules/@github/**/copilot,
+        }
+
+  gemini:
+    name: gemini
+    endpoints:
+      - { host: generativelanguage.googleapis.com, port: 443 }
+      - { host: "*-aiplatform.googleapis.com", port: 443 }
+      - { host: cloudcode-pa.googleapis.com, port: 443 }
+      - { host: accounts.google.com, port: 443 }
+      - { host: oauth2.googleapis.com, port: 443 }
+      - { host: www.googleapis.com, port: 443 }
+      - { host: iamcredentials.googleapis.com, port: 443 }
+    binaries:
+      - { path: /usr/bin/gemini }
+      - { path: /usr/lib/node_modules/@google/gemini-cli/dist/index.js }
+      - { path: /usr/bin/node }