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/tui/src/index.ts

@@ -0,0 +1,29 @@
+// Core TUI interfaces and classes
+
+// Autocomplete support
+export {
+	type AutocompleteItem,
+	type AutocompleteProvider,
+	CombinedAutocompleteProvider,
+	type SlashCommand,
+} from "./autocomplete.js";
+// Logger for debugging
+export { type LoggerConfig, logger } from "./logger.js";
+// Markdown component
+export { MarkdownComponent } from "./markdown-component.js";
+// Select list component
+export { type SelectItem, SelectList } from "./select-list.js";
+// Text component
+export { TextComponent } from "./text-component.js";
+// Text editor component
+export { TextEditor, type TextEditorConfig } from "./text-editor.js";
+export {
+	type Component,
+	type ComponentRenderResult,
+	Container,
+	type ContainerRenderResult,
+	type Padding,
+	TUI,
+} from "./tui.js";
+// Whitespace component
+export { WhitespaceComponent } from "./whitespace-component.js";