Implement Go CLI with logout command

[Copilot]

Adds a Go-based CLI tool with a logout command that clears stored authentication credentials.

Implementation

• CLI Framework: Uses Cobra for command structure and help generation
• Logout Command (commands/logout.go): Removes credentials from ~/.miago/credentials
  • Returns clear error when no active session exists
  • Handles filesystem errors gracefully
• Entry Point (main.go): Minimal root command setup
• Tests (commands/logout_test.go): Verifies logout behavior and error cases using temporary directories

Usage

$ miago logout
Successfully logged out

$ miago logout
Error during logout: no active session found

Dependencies

• github.com/spf13/cobra@v1.10.2 - CLI framework
• No security vulnerabilities in dependency tree

Original prompt

commands/logout.go

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