Implement plugin system

[tobiase]

Overview

Allow extending wt with plugins from external repositories.

Priority: Low - This is a nice-to-have feature but not essential for core functionality.

Design

Plugin structure

my-wt-plugin/
├── plugin.yaml     # Metadata
├── main.go        # Plugin code
└── README.md

plugin.yaml

name: deploy
version: 1.0.0
description: Deploy worktree to staging
commands:
  - name: deploy
    description: Deploy current worktree

Commands

• wt plugin add github.com/user/wt-deploy
• wt plugin list
• wt plugin remove deploy
• wt plugin create my-plugin

Implementation considerations

• Plugin discovery and loading
• Version management
• Security (signing?)
• Plugin isolation
• Configuration merging

MVP scope

• Simple executable plugins
• JSON/stdout communication
• Manual installation