Allow batch to be a range

[nhz2]

This allows running a subset of jobs in a single process.

This is useful to avoid job or process limits on Zaratan.

The tests were generated by Claude

[Copilot]

Pull Request Overview

This PR extends the batch functionality to support ranges of jobs instead of just single job indices or running all jobs. This allows users to run a subset of jobs in a single process, which is useful for avoiding job or process limits on compute clusters like Zaratan.

• Updates CLI parsing to accept range syntax (e.g., "1:3", "begin:end", "2:3:10")
• Replaces single batch index with batch range in data structures and processing logic
• Adds comprehensive test coverage for various range formats and error conditions

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/cli-parsing.jl	Implements range parsing logic and updates CLI option structure
src/run-sim.jl	Updates job processing to iterate over batch range instead of single job
test/test_arg-parsing.jl	Adds extensive test cases for range parsing and error handling
README.md	Updates documentation to reflect new range functionality

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