Speed up desktop publish

[RhysSullivan]

Moves the desktop publish matrix to Blacksmith runners, parallelizes the release asset uploads, and adds a dry_run input to rehearse the workflow against an existing tag without touching its GitHub release.

The windows leg spent 5m35s in bun install on GitHub-hosted runners and gated the release job. On Blacksmith the same install takes 16-55s. The whole publish drops from 10-15 minutes to about 6.

Measured on rehearsal runs against v1.6.7:

• before: 11m44s (the real v1.6.7 publish)
• after: ~5m30s build phase, consistent across three runs; add ~40s for the release job on a real publish
• critical path is now the mac legs' Apple notarization wait (~2-2.5 min, Apple-side)

Notes:

• Blacksmith windows runners are public beta. If they queue or misbehave, reverting the runs-on labels is the whole rollback.
• No package caches on purpose: a cold bun install on these runners is as fast as restore + warm install, and bun.lock changes every release, so caches would only add a save tail. There is a comment in the workflow.

Rehearsal runs (dry_run=true, tag v1.6.7):

• https://github.com/UsefulSoftwareCo/executor/actions/runs/33370626786 (cold, with caches)
• https://github.com/UsefulSoftwareCo/executor/actions/runs/33371235821 (warm caches — no better)
• https://github.com/UsefulSoftwareCo/executor/actions/runs/33371802230 (final config)

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