feat: v2.0 distribution — IDE integrations, zero-config installer, README overhaul

- Add integration guides for Xcode 26.3, Cursor, VS Code, JetBrains, Windsurf
- First cognitive memory server with documented Xcode 26.3 MCP support
- Add npx @vestige/init — zero-config CLI that auto-detects IDEs and injects config
- Overhaul README: "The open-source cognitive engine for AI"
- Add "Why Not Just Use RAG?" comparison and cognitive science stack docs
- Update license badge to AGPL-3.0

docs/integrations/cursor.md

@@ -0,0 +1,142 @@
+# Cursor
+
+> Give Cursor a brain that remembers between sessions.
+
+Cursor has native MCP support. Add Vestige and your AI assistant remembers your architecture, preferences, and past fixes across every session.
+
+---
+
+## Setup
+
+### 1. Create or edit the config file
+
+**Global (all projects):**
+
+| Platform | Path |
+|----------|------|
+| macOS / Linux | `~/.cursor/mcp.json` |
+| Windows | `%USERPROFILE%\.cursor\mcp.json` |
+
+```bash
+# macOS / Linux
+mkdir -p ~/.cursor
+open -e ~/.cursor/mcp.json
+```
+
+### 2. Add Vestige
+
+```json
+{
+  "mcpServers": {
+    "vestige": {
+      "command": "/usr/local/bin/vestige-mcp",
+      "args": [],
+      "env": {}
+    }
+  }
+}
+```
+
+> **Use absolute paths.** Cursor does not reliably resolve relative paths or `~`. Run `which vestige-mcp` to find your binary location.
+
+**Windows:**
+```json
+{
+  "mcpServers": {
+    "vestige": {
+      "command": "C:\\Users\\you\\.cargo\\bin\\vestige-mcp.exe",
+      "args": [],
+      "env": {}
+    }
+  }
+}
+```
+
+### 3. Restart Cursor
+
+Fully quit and reopen Cursor. The MCP server loads on startup.
+
+### 4. Verify
+
+Open Cursor's AI chat and ask:
+
+> "What MCP tools do you have access to?"
+
+You should see Vestige's tools listed (search, smart_ingest, memory, etc.).
+
+---
+
+## First Use
+
+Ask Cursor's AI:
+
+> "Remember that this project uses React with TypeScript and Tailwind CSS"
+
+Start a **new chat session**, then:
+
+> "What tech stack does this project use?"
+
+It remembers.
+
+---
+
+## Project-Specific Memory
+
+To isolate memory per project, use `--data-dir`:
+
+```json
+{
+  "mcpServers": {
+    "vestige": {
+      "command": "/usr/local/bin/vestige-mcp",
+      "args": ["--data-dir", "/Users/you/projects/my-app/.vestige"],
+      "env": {}
+    }
+  }
+}
+```
+
+Or place a `.cursor/mcp.json` in the project root for project-level config.
+
+---
+
+## Troubleshooting
+
+<details>
+<summary>Vestige tools not appearing</summary>
+
+1. Verify the binary exists:
+   ```bash
+   which vestige-mcp
+   ```
+2. Test the binary manually:
+   ```bash
+   echo '{}' | vestige-mcp
+   ```
+3. Check the config is valid JSON:
+   ```bash
+   cat ~/.cursor/mcp.json | python3 -m json.tool
+   ```
+4. Fully restart Cursor (Cmd+Q / Alt+F4, not just close window).
+</details>
+
+<details>
+<summary>Silent failures</summary>
+
+Cursor does not surface MCP server errors in the UI. Test by running the command directly in your terminal to see actual error output.
+</details>
+
+---
+
+## Also Works With
+
+| IDE | Guide |
+|-----|-------|
+| Xcode 26.3 | [Setup](./xcode.md) |
+| VS Code (Copilot) | [Setup](./vscode.md) |
+| JetBrains | [Setup](./jetbrains.md) |
+| Windsurf | [Setup](./windsurf.md) |
+| Claude Code | [Setup](../CONFIGURATION.md#claude-code-one-liner) |
+| Claude Desktop | [Setup](../CONFIGURATION.md#claude-desktop-macos) |
+
+Your AI remembers everything, everywhere.