[Auto] Add vagrant completions

[peicodes]

Add command completions for vagrant, a popular tool for building and managing virtual machine environments for development.

Fish shell reference implementation: https://github.com/fish-shell/fish-shell/blob/master/share/completions/vagrant.fish

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Linear: APP-3965

[oz-for-oss]

@peicodes

Here's what I found while triaging this issue:

This looks like an actionable enhancement request: add Warp completions for the vagrant CLI using the linked fish-shell implementation as a reference.

Maintainer details

I concluded that feature request to add Warp command completions for the vagrant CLI, with no duplicate found..

Triage summary

This is an enhancement request to add command completions for the vagrant CLI. The request is specific and includes a fish-shell reference implementation, so it is actionable without reporter follow-up.

Reproducibility

High. The reported gap is deterministic: Warp currently has no visible vagrant command signature in this checkout, and completion support can be verified by trying to complete vagrant subcommands/options.

Likely implementation area

The completion registry loads embedded command signatures and separately registers Warp CLI completions. A fix likely belongs in the command-signature source used by warp-command-signatures/the completions engine, with updates for Vagrant's top-level subcommands (box, cloud, plugin, snapshot, up, ssh, etc.), options, and useful dynamic values where feasible.

Duplicate check

Searched all open non-PR issues in warpdotdev/warp (3,194 candidates), excluding #9781, plus recently closed issues for exact vagrant mentions. No likely duplicate was found.

This is my automated analysis and may be incorrect. A maintainer will verify the details.

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[oz-for-oss]

This issue has been labeled ready-to-implement and is open for contributions involving code changes. If you'd like to tackle it, feel free to open a pull request against this issue. You can also comment @oz-agent on this issue to have the bot draft an implementation PR automatically.