fix: logo 右半部分从 CODING 改为 CODE

去掉难以正确渲染的 N 和 G 字母，右半部分简化为 CODE（4 字母），
与左半部分 AIR 组合为 AIR CODE。

SECURITY.md

@@ -0,0 +1,47 @@
+# Security
+
+## IMPORTANT
+
+We do not accept AI generated security reports. We receive a large number of
+these and we absolutely do not have the resources to review them all. If you
+submit one that will be an automatic ban from the project.
+
+## Threat Model
+
+### Overview
+
+OpenCode is an AI-powered coding assistant that runs locally on your machine. It provides an agent system with access to powerful tools including shell execution, file operations, and web access.
+
+### No Sandbox
+
+OpenCode does **not** sandbox the agent. The permission system exists as a UX feature to help users stay aware of what actions the agent is taking - it prompts for confirmation before executing commands, writing files, etc. However, it is not designed to provide security isolation.
+
+If you need true isolation, run OpenCode inside a Docker container or VM.
+
+### Server Mode
+
+Server mode is opt-in only. When enabled, set `OPENCODE_SERVER_PASSWORD` to require HTTP Basic Auth. Without this, the server runs unauthenticated (with a warning). It is the end user's responsibility to secure the server - any functionality it provides is not a vulnerability.
+
+### Out of Scope
+
+| Category                        | Rationale                                                               |
+| ------------------------------- | ----------------------------------------------------------------------- |
+| **Server access when opted-in** | If you enable server mode, API access is expected behavior              |
+| **Sandbox escapes**             | The permission system is not a sandbox (see above)                      |
+| **LLM provider data handling**  | Data sent to your configured LLM provider is governed by their policies |
+| **MCP server behavior**         | External MCP servers you configure are outside our trust boundary       |
+| **Malicious config files**      | Users control their own config; modifying it is not an attack vector    |
+
+---
+
+# Reporting Security Issues
+
+We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
+
+To report a security issue, please use the GitHub Security Advisory ["Report a Vulnerability"](https://github.com/anomalyco/opencode/security/advisories/new) tab.
+
+The team will send a response indicating the next steps in handling your report. After the initial reply to your report, the security team will keep you informed of the progress towards a fix and full announcement, and may ask for additional information or guidance.
+
+## Escalation
+
+If you do not receive an acknowledgement of your report within 6 business days, you may send an email to security@anoma.ly