Update AGENTS.md for current loop workflows

[axeldelafosse]

Summary

• correct the loop default behavior to reflect paired interactive --tmux startup
• document loop dashboard as the live panel entrypoint
• add current contributor commands for global install aliases and patch releases
• note the existing PLAN.md fallback when options are passed without a prompt

Testing

• Not run (not requested)

[gemini-code-assist]

Code Review

This pull request updates the AGENTS.md documentation to include new commands for global installation and patch releases. It also clarifies the default behavior of the loop command, noting that running it without arguments now starts a tmux workspace while loop dashboard is used for the live panel. Additionally, it documents the fallback behavior for reusing PLAN.md when prompts are omitted. I have no feedback to provide.