dist/index.js is stale: prebuilt-binary support in src/ was never shipped

Summary

src/ installs prebuilt V binaries for tagged versions (downloadPrebuilt in src/github-api-helper.ts, added in 12a9fab), but the shipped dist/index.js — what actually runs — contains zero references to prebuilt logic (verified at both 2af0f76 and 1cb8013: grep -c prebuilt dist/index.js → 0). So every cold-cache run falls back to building V from source.

Impact

Upstream source builds are currently broken by vc/V skew (make fresh_vc clones floating vc under a fixed V source: C.open redefinition today, vlib/v3 type errors earlier), so all consumers without a warm GHA cache are red with no workaround short of vendoring the install. Rebuilding + releasing dist would unblock everyone and make version/version-file + stable resolve to the checksummed prebuilt assets as designed.

Environment

• Action refs checked: 2af0f76cef8d32cea291b7ee9a259c37336a6441, 1cb8013ba
• Consumer evidence: Create-Vlang-App/cva-templates (cold cache → source build → failure in Set up V); Create-Vlang-App/create-vlang-app (warm cache → green on identical inputs)

Thanks for the prebuilt feature — just needs a dist rebuild to reach users.

Start with src/github-api-helper.ts, especially downloadPrebuilt, and compare its prebuilt handling with the shipped dist/index.js. Rebuild the distribution and verify that dist/index.js contains the prebuilt logic so tagged-version installs use the checksummed assets instead of the source build.