Add Pi Research Agent package

Autonomous research agent with web search, source analysis, and report synthesis.
Built on Pi agent core. Available as CLI, programmatic API, and MCP server.

Features:
- 4 built-in tools: web_search, read_url, save_note, synthesize_report
- CLI with TUI and print modes
- Programmatic API via ResearchAgent class
- MCP server with 3 tools: research, quick_search, read_url
- Skills system for custom research behavior
- Automatic .env file loading for API keys
- Configurable max turns, output formats (markdown/JSON/bullet)
- Automatic report saving to research-output/

packages/research-agent/examples/mcp-config-cursor.json

@@ -0,0 +1,8 @@
+{
+  "mcpServers": {
+    "research-agent": {
+      "command": "node",
+      "args": ["./node_modules/@earendil-works/pi-research-agent/dist/mcp-cli.js"]
+    }
+  }
+}