⚡ Bolt: batch local branch deletions in script.ps1

[Cylae]

What

Batched local branch deletions into a single git branch -D call in script.ps1.

Why

Previously, script.ps1 iterated over local branches using ForEach-Object and invoked git branch -D for every branch individually. Spawning a new git process per branch created N+1 process creation overhead.

Impact

Significantly reduces execution time during the final branch cleanup phase when many local branches exist.

Measurement

In testing with local mock branches, passing the array of branches directly to git branch -D reduced branch cleanup from N native process invocations to 1.

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PR created automatically by Jules for task 8139455345565367408 started by @Cylae

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