docs(app): Add README.md for CLI and UI crates

crates/app/cli/README.md

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+# Owlen CLI
+
+The command-line interface for the Owlen AI agent.
+
+## Features
+- **Interactive Chat:** Communicate with the AI agent directly from your terminal.
+- **Tool Integration:** Built-in support for filesystem operations, bash execution, and more.
+- **Provider Management:** Easily switch between different LLM providers (Ollama, Anthropic, OpenAI).
+- **Session Management:** Persist conversation history and resume previous sessions.
+- **Secure Authentication:** Managed authentication flows for major AI providers.
+
+## Usage
+
+### Direct Invocation
+```bash
+# Start an interactive chat session
+owlen
+
+# Ask a single question
+owlen "How do I list files in Rust?"
+```
+
+### Commands
+- `owlen config`: View or modify agent configuration.
+- `owlen login <provider>`: Authenticate with a specific LLM provider.
+- `owlen session`: Manage chat sessions.
+
+## Configuration
+Owlen uses a global configuration file located at `~/.config/owlen/config.toml`. You can also provide project-specific settings via an `.owlen.toml` file in your project root.

crates/app/ui/README.md

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+# Owlen UI
+
+A Terminal User Interface (TUI) for the Owlen AI agent, built with Ratatui.
+
+## Features
+- **Rich Text Rendering:** Markdown support with syntax highlighting for code blocks.
+- **Interactive Components:** Intuitive panels for chat, tool execution, and session status.
+- **Real-time Streaming:** Smooth display of agent output as it's generated.
+- **Task Visualization:** Dedicated view for tracking the agent's progress through a task list.
+
+## Architecture
+The UI is built using an event-driven architecture integrated with the `agent-core` event stream. It leverages `ratatui` for terminal rendering and `crossterm` for event handling.
+
+## Components
+- `ChatPanel`: Displays the conversation history.
+- `TaskPanel`: Shows the current implementation plan and task status.
+- `ToolPanel`: Visualizes active tool executions and their output.
+- `ModelPicker`: Allows selecting between available LLM providers and models.