git worktree for tags/refs

[tony]

Problem / use-case

LLMs need a rapid way to clone a repo at trunk, then have access to one or multiple tags/refs/branches. git worktree provides a way of rapidly creating and managing versioned source code bases for studying / context harvesting in agentic flows.

Create a mechanism where repos in vcspull can have worktrees at a tag, branch, or ref.

~/repos/:
  myproject:
    repo: 'git....project'
    worktrees:
      - dir: ../myproject-1.2.3
        tag: v1.2.3
      - dir: ../myproject-1.1.1
        tag: v1.1.1
      - dir: ../myproject-1.x
        tag: v1.x