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/jetbrains.md

@@ -0,0 +1,129 @@
+# JetBrains (IntelliJ, WebStorm, PyCharm, etc.)
+
+> Give your JetBrains AI assistant a brain that remembers.
+
+JetBrains IDEs (2025.2+) have built-in MCP support. Vestige integrates through the MCP server settings, giving your AI assistant persistent memory across sessions.
+
+---
+
+## Prerequisites
+
+- **JetBrains IDE 2025.2+** (IntelliJ IDEA, WebStorm, PyCharm, GoLand, etc.)
+- **vestige-mcp** binary installed ([Installation guide](../../README.md#quick-start))
+
+---
+
+## Setup
+
+### Option A: Auto-Configure (Recommended)
+
+JetBrains can auto-configure MCP servers for connected clients:
+
+1. Open **Settings** (`Cmd+,` / `Ctrl+Alt+S`)
+2. Navigate to **Tools > MCP Server**
+3. Click **"+"** to add a new MCP server
+4. Configure:
+   - **Name:** `vestige`
+   - **Command:** `/usr/local/bin/vestige-mcp`
+   - **Arguments:** (leave empty)
+5. Click **Apply**
+
+### Option B: Junie AI Config
+
+If using JetBrains Junie AI, add Vestige to the Junie MCP config:
+
+**User-level (all projects):**
+
+```bash
+mkdir -p ~/.junie/mcp
+```
+
+Edit `~/.junie/mcp/mcp.json`:
+
+```json
+{
+  "mcpServers": {
+    "vestige": {
+      "command": "/usr/local/bin/vestige-mcp",
+      "args": [],
+      "env": {}
+    }
+  }
+}
+```
+
+**Project-level:**
+
+Create `.junie/mcp/mcp.json` in your project root with the same format.
+
+### Option C: Via External Client
+
+JetBrains exposes its own tools via MCP. You can also use Vestige through an external client (Claude Code, Cursor) that connects to JetBrains:
+
+1. In JetBrains: **Settings > Tools > MCP Server**
+2. Click **Auto-Configure** for your preferred client
+3. Add Vestige to that client's config (see [Cursor](./cursor.md), [VS Code](./vscode.md))
+
+---
+
+## Verify
+
+After configuration, the MCP server should appear in **Settings > Tools > MCP Server** with a green status indicator.
+
+Test by asking your AI assistant:
+
+> "Remember that this project uses Spring Boot with Kotlin and follows hexagonal architecture"
+
+---
+
+## Project-Specific Memory
+
+Isolate memory per project:
+
+```json
+{
+  "mcpServers": {
+    "vestige": {
+      "command": "/usr/local/bin/vestige-mcp",
+      "args": ["--data-dir", "/Users/you/projects/my-app/.vestige"],
+      "env": {}
+    }
+  }
+}
+```
+
+---
+
+## Troubleshooting
+
+<details>
+<summary>MCP server not appearing in settings</summary>
+
+1. Verify your IDE version is 2025.2 or later.
+2. Check that the binary path is absolute:
+   ```bash
+   which vestige-mcp
+   ```
+3. Restart the IDE after adding the configuration.
+</details>
+
+<details>
+<summary>Finding your client's config file</summary>
+
+In **Settings > Tools > MCP Server**, click the expansion arrow next to your client, then select **"Open Client Settings File"** to see the exact config path.
+</details>
+
+---
+
+## Also Works With
+
+| IDE | Guide |
+|-----|-------|
+| Xcode 26.3 | [Setup](./xcode.md) |
+| Cursor | [Setup](./cursor.md) |
+| VS Code (Copilot) | [Setup](./vscode.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.