v0.4.0

What's New

• --agent-help flag — prints the full agent usage guide (AGENTS.md) with command reference, response shapes, jq pipelines, and workflow examples
• Improved login UX — interactive banner with signup URL, hidden API key input, helpful error message for non-interactive terminals
• AGENTS.md bundled — comprehensive reference doc for LLM agents using the CLI
• Config file format and directory-walking behavior documented in loopsh login --help