docs: add codex-supermemory integration page

Adds apps/docs/integrations/codex.mdx with installation, configuration,
and usage docs for the codex-supermemory plugin. Also registers the page
in docs.json under the Plugins tab alongside openclaw, claude-code, and opencode.

apps/docs/docs.json

@@ -185,6 +185,7 @@
 							"integrations/openclaw",
 							"integrations/claude-code",
 							"integrations/opencode",
+							"integrations/codex",
 							"integrations/hermes"
 						]
 					}

apps/docs/integrations/codex.mdx

@@ -0,0 +1,141 @@
+---
+title: "OpenAI Codex"
+sidebarTitle: "OpenAI Codex"
+description: "codex-supermemory — persistent memory for OpenAI Codex CLI"
+icon: "terminal"
+---
+
+<Warning>
+This integration requires the **Supermemory Pro plan**. [Upgrade here](https://console.supermemory.ai/billing).
+</Warning>
+
+[codex-supermemory](https://github.com/supermemoryai/codex-supermemory) wires Supermemory into the [OpenAI Codex CLI](https://github.com/openai/codex) via its hooks system. Your agent automatically recalls relevant context before each prompt and captures the conversation after each session — no slash commands required.
+
+## Get Your API Key
+
+Create a Supermemory API key from the [API Keys](https://console.supermemory.ai/keys) page, then export it in your shell profile:
+
+<Tabs>
+  <Tab title="macOS / Linux (zsh)">
+    ```bash
+    echo 'export SUPERMEMORY_CODEX_API_KEY="sm_..."' >> ~/.zshrc
+    source ~/.zshrc
+    ```
+  </Tab>
+  <Tab title="macOS / Linux (bash)">
+    ```bash
+    echo 'export SUPERMEMORY_CODEX_API_KEY="sm_..."' >> ~/.bashrc
+    source ~/.bashrc
+    ```
+  </Tab>
+  <Tab title="Windows (PowerShell)">
+    ```powershell
+    [System.Environment]::SetEnvironmentVariable("SUPERMEMORY_CODEX_API_KEY", "sm_...", "User")
+    ```
+    Restart your terminal after running this.
+  </Tab>
+</Tabs>
+
+## Install the Plugin
+
+```bash
+npx codex-supermemory@latest install
+```
+
+This command:
+- Copies hook scripts to `~/.codex/supermemory/`
+- Enables `codex_hooks = true` in `~/.codex/config.toml`
+- Registers `UserPromptSubmit` (recall) and `Stop` (capture) hooks in `~/.codex/hooks.json`
+
+Restart Codex CLI after installing.
+
+## How It Works
+
+Once installed, the plugin runs automatically on every Codex session:
+
+- **Recall** — Before each prompt, relevant memories and your user profile are fetched from Supermemory and injected as additional context.
+- **Capture** — After each session ends, the conversation transcript is ingested into Supermemory, scoped to the current project and user.
+- **Privacy** — Content wrapped in `<private>...</private>` tags is redacted before storage.
+
+### Memory Scopes
+
+Memories are tagged with two container tags per session:
+
+| Tag | Format | Description |
+|-----|--------|-------------|
+| User | `codex_user_{sha256}` | Memories shared across all your projects |
+| Project | `codex_project_{sha256}` | Memories scoped to the current working directory |
+
+## Verify Installation
+
+```bash
+npx codex-supermemory status
+```
+
+Expected output when everything is configured:
+
+```
+codex-supermemory status:
+
+  API key:       ✓ set (SUPERMEMORY_CODEX_API_KEY)
+  Hook scripts:  ✓ installed at ~/.codex/supermemory
+  hooks.json:    ✓ registered
+  config.toml:   ✓ exists
+
+All good! Memory is active.
+```
+
+## Uninstall
+
+```bash
+npx codex-supermemory uninstall
+```
+
+This removes the hook registrations from `~/.codex/hooks.json` and disables `codex_hooks` in `~/.codex/config.toml`. Your existing memories in Supermemory are preserved.
+
+## Configuration
+
+Create `~/.codex/supermemory.json` to override defaults:
+
+```json
+{
+  "apiKey": "sm_...",
+  "similarityThreshold": 0.6,
+  "maxMemories": 5,
+  "maxProfileItems": 5,
+  "injectProfile": true,
+  "containerTagPrefix": "codex",
+  "debug": false
+}
+```
+
+| Option | Default | Description |
+|--------|---------|-------------|
+| `apiKey` | — | API key (overrides env var) |
+| `similarityThreshold` | `0.6` | Minimum match score for recall (0–1) |
+| `maxMemories` | `5` | Max memories injected per prompt |
+| `maxProfileItems` | `5` | Max profile facts injected per prompt |
+| `injectProfile` | `true` | Include user profile in context |
+| `containerTagPrefix` | `"codex"` | Prefix for container tags |
+| `debug` | `false` | Write debug logs to `~/.codex-supermemory.log` |
+
+## Logging
+
+Enable debug logging to trace hook activity:
+
+```bash
+export SUPERMEMORY_DEBUG=true
+tail -f ~/.codex-supermemory.log
+```
+
+## Next Steps
+
+<CardGroup cols={2}>
+  <Card title="GitHub Repository" icon="github" href="https://github.com/supermemoryai/codex-supermemory">
+    Source code, issues, and detailed README.
+  </Card>
+
+  <Card title="Claude Code Plugin" icon="code" href="/integrations/claude-code">
+    Memory plugin for Claude Code.
+  </Card>
+</CardGroup>