Switch GitHub Actions runners from ubuntu-latest to Blacksmith for faster CI
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Description
We are currently using GitHub's default hosted runners (`ubuntu-latest`) in our CI workflows.
I propose switching to **[Blacksmith](https://blacksmith.sh/)** runners (e.g. `blacksmith-4vcpu-ubuntu-2404`). This is a **drop-in replacement** that typically makes CI **~2x faster** with much quicker cache downloads.
### References
- Recent example from Theo (t3dotgg) showing real speedup after switching:
https://x.com/theo/status/2027505221686215029?s=20
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