feat(sieve): complete formula for sieve

## Summary

The `sieve` formula needs to be completed with proper values.

## Required Changes

1. Add a proper description
2. Set homepage URL
3. Remove all template comments
4. Set the correct license
5. Add proper `url` and `sha256` for a release
6. Update the `test` block with a real test

## References

- [Homebrew Formula Cookbook](https://docs.brew.sh/Formula-Cookbook)

Start with the sieve formula and the Homebrew Formula Cookbook linked in the issue. Verify the release metadata needed for the description, homepage, license, URL, and SHA256, remove template comments, and define a real test in the formula's test block. Done means the formula has complete release values and its test passes.

Written by the indexing model from the issue text.