docs: add Codex CLI setup notes

docs/codex-cli-setup.md

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+# Codex CLI setup notes
+
+This guide covers a small, Codex-focused setup path for CodeGraph. It assumes you already have Codex CLI installed and want CodeGraph available as an MCP server across your projects.
+
+## Install CodeGraph
+
+Use the platform installer if you do not want to manage Node.js yourself:
+
+```bash
+# macOS / Linux
+curl -fsSL https://raw.githubusercontent.com/colbymchenry/codegraph/main/install.sh | sh
+
+# Windows PowerShell
+irm https://raw.githubusercontent.com/colbymchenry/codegraph/main/install.ps1 | iex
+```
+
+If you already use Node.js, the npm package works too:
+
+```bash
+npx @colbymchenry/codegraph
+# or
+npm install -g @colbymchenry/codegraph
+```
+
+## Configure Codex CLI
+
+Run the installer and choose Codex CLI when prompted. For a non-interactive setup, target Codex directly:
+
+```bash
+codegraph install --target=codex --location=global --yes
+```
+
+Codex CLI uses global configuration, so CodeGraph writes its MCP server entry under your home Codex config directory. If you want to inspect the config before writing it, print the snippet first:
+
+```bash
+codegraph install --print-config codex
+```
+
+After installation, restart Codex CLI so it reloads the MCP server configuration.
+
+## Initialize a project index
+
+From the repository you want Codex to understand, build the local CodeGraph index:
+
+```bash
+cd your-project
+codegraph init -i
+```
+
+The `-i` flag initializes `.codegraph/` and builds the first index in one step. Without it, run `codegraph index` afterwards.
+
+## Verify the index
+
+Use the CLI status command from the project root:
+
+```bash
+codegraph status
+```
+
+Inside Codex, ask a codebase question after the restart. When `.codegraph/` exists, CodeGraph's MCP tools should be available for structural search, context, callers, callees, impact, and status queries.
+
+## Windows and WSL notes
+
+- Run the Windows PowerShell installer from Windows projects, and the shell installer from Linux or WSL projects.
+- Keep the project and its `.codegraph/` directory on the same filesystem where you work. For WSL, prefer the Linux filesystem for WSL-based development rather than repeatedly crossing `/mnt/c`.
+- If `codegraph status` reports a journal mode other than `wal` on a mounted or network filesystem, move the project to a local disk before relying on concurrent reads and writes.
+
+## Uninstall or clean up
+
+Remove CodeGraph from configured agents:
+
+```bash
+codegraph uninstall --target=codex --yes
+```
+
+Remove a project's local index when you no longer need it:
+
+```bash
+codegraph uninit
+```
+
+The uninstall command removes the Codex MCP server config. `codegraph uninit` removes the per-project `.codegraph/` index.