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

tsconfig.json

@@ -0,0 +1,11 @@
+{
+	"extends": "./tsconfig.base.json",
+	"compilerOptions": {
+		"paths": {
+			"@mariozechner/pi-tui": ["./packages/tui/src/index.ts"],
+			"@mariozechner/pi-agent": ["./packages/agent/src/index.ts"],
+			"@mariozechner/pi": ["./packages/pods/src/index.ts"]
+		}
+	},
+	"include": ["packages/*/src/**/*"]
+}