⚡ Bolt: optimize local branch cleanup with argument batching

[Cylae]

What

Batches local branch deletions into a single git branch -D process call instead of invoking git branch -D inside a ForEach-Object pipeline loop for each branch in script.ps1.

Why

In PowerShell, running a native binary like git inside a loop incurs significant process invocation overhead for every item. Passing an array of branch names to git branch -D allows Git to process all branches in a single process execution.

Impact

Eliminates N+1 process creation overhead during post-merge branch cleanup.

Measurement

Benchmarked deletion of 20 test branches using /tmp/pwsh/pwsh:

• Loop method (ForEach-Object calling git branch -D per branch): 627 ms
• Batched method (git branch -D $branchesToDelete): 111 ms
• Improvement: ~82% reduction in branch cleanup time (~5.6x speedup).

---

PR created automatically by Jules for task 13071687819626879631 started by @Cylae

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.