setup_builder: wait for non-zero device size before formatting sticky disk (release/v2)

[piob-io]

Summary

Backport of #118 to release/v2: newly exposed sticky disk devices can momentarily report size 0 (the expose/resize race), and formatting at that instant produces a tiny/broken filesystem. setupStickyDisk now polls blockdev --getsize64 until the device reports a non-zero size (bounded wait) before mkfs/mount, failing with a clear error if the device never becomes ready.

Source change cherry-picked cleanly from main (1bee150); dist/ rebuilt against this branch's dependencies.

Link to Devin session: https://app.devin.ai/sessions/ba61e842e479410d95116fe1dfe77b0f
Requested by: @piob-io

---

^{Need help on this PR? Tag /codesmith with what you need. Autofix is disabled.}

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment, CI, and merge conflict monitoring