feat: add Junie agent integration

Add support for JetBrains Junie AI agent:
- Create .junie/guidelines.md with workflow instructions
- Create .junie/mcp/mcp.json for MCP server configuration
- Add 'junie' to BuiltinRecipes in recipes.go
- Add runJunieRecipe() handler in setup.go
- Add website documentation
- Add integrations/junie/README.md

Usage: bd setup junie

integrations/junie/README.md

@@ -0,0 +1,89 @@
+# Junie Integration for Beads
+
+Integration for [Junie](https://www.jetbrains.com/junie/) (JetBrains AI Agent) with beads issue tracking.
+
+## Prerequisites
+
+```bash
+# Install beads
+curl -fsSL https://raw.githubusercontent.com/steveyegge/beads/main/scripts/install.sh | bash
+
+# Initialize beads in your project
+bd init
+```
+
+## Installation
+
+```bash
+bd setup junie
+```
+
+This creates:
+- `.junie/guidelines.md` - Agent instructions for beads workflow
+- `.junie/mcp/mcp.json` - MCP server configuration
+
+## What Gets Installed
+
+### Guidelines (`.junie/guidelines.md`)
+
+Junie automatically reads this file on session start. It contains:
+- Core workflow rules for using beads
+- Command reference for the `bd` CLI
+- Issue types and priorities
+- MCP tool documentation
+
+### MCP Config (`.junie/mcp/mcp.json`)
+
+Configures the beads MCP server so Junie can use beads tools directly:
+
+```json
+{
+  "mcpServers": {
+    "beads": {
+      "command": "bd",
+      "args": ["mcp"]
+    }
+  }
+}
+```
+
+## Usage
+
+Once installed, Junie will:
+1. Read workflow instructions from `.junie/guidelines.md`
+2. Have access to beads MCP tools for direct issue management
+3. Be able to use `bd` CLI commands
+
+### MCP Tools Available
+
+- `mcp_beads_ready` - Find tasks ready for work
+- `mcp_beads_list` - List issues with filters
+- `mcp_beads_show` - Show issue details
+- `mcp_beads_create` - Create new issues
+- `mcp_beads_update` - Update issue status/priority
+- `mcp_beads_close` - Close completed issues
+- `mcp_beads_dep` - Manage dependencies
+- `mcp_beads_blocked` - Show blocked issues
+- `mcp_beads_stats` - Get issue statistics
+
+## Verification
+
+```bash
+bd setup junie --check
+```
+
+## Removal
+
+```bash
+bd setup junie --remove
+```
+
+## Related
+
+- `bd prime` - Get full workflow context
+- `bd ready` - Find unblocked work
+- `bd sync` - Sync changes to git (run at session end)
+
+## License
+
+Same as beads (see repository root).