docs(tools): Add README.md for all tool crates

crates/tools/bash/README.md

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+# Owlen Bash Tool
+
+Shell execution tool for the Owlen AI agent.
+
+## Overview
+This crate enables the agent to execute bash commands in the local environment. It provides both immediate execution and long-running background shell support.
+
+## Features
+- **Interactive Shells:** Persist shell state across multiple command invocations.
+- **Background Processes:** Run commands in the background and retrieve output later.
+- **Security:** Integrated with the permissions system to prevent unauthorized command execution.