Initial monorepo setup with npm workspaces and dual TypeScript configuration

- Set up npm workspaces for three packages: pi-tui, pi-agent, and pi (pods)
- Implemented dual TypeScript configuration:
  - Root tsconfig.json with path mappings for development and type checking
  - Package-specific tsconfig.build.json for clean production builds
- Configured lockstep versioning with sync script for inter-package dependencies
- Added comprehensive documentation for development and publishing workflows
- All packages at version 0.5.0 ready for npm publishing

packages/agent/src/renderers/json-renderer.ts

@@ -0,0 +1,7 @@
+import type { AgentEvent, AgentEventReceiver } from "../agent.js";
+
+export class JsonRenderer implements AgentEventReceiver {
+	async on(event: AgentEvent): Promise<void> {
+		console.log(JSON.stringify(event));
+	}
+}