feat: add archive script support for worktrees

[paul-bouzian]

Summary

Add the ability to configure commands that run when a workspace is archived, mirroring the existing setup script functionality.

• Add archive-worktree, archive-worktree-unix, archive-worktree-windows config keys
• Add getArchiveCommands() and executeWorktreeArchive() functions
• Integrate archive script execution in chats.archive mutation
• Add "Archive Commands" section to project worktree settings UI

How it works

The archive script runs whenever a workspace with a worktree is archived, before the worktree is deleted (if deletion is requested). This allows users to run cleanup tasks like:

• git fetch --prune - clean up remote tracking branches
• git branch -d feature-branch - delete local branches
• Custom cleanup scripts

Configuration

Commands are stored in .1code/worktree.json alongside setup commands:

{
  "setup-worktree": ["bun install"],
  "archive-worktree": ["git fetch --prune"]
}

Test plan

• Configure archive commands in Settings → Project → Worktree Scripts
• Archive a workspace and verify commands run (check console logs)
• Verify worktree deletion still works after archive script runs
• Test platform-specific overrides (unix/windows)

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