feat: workerd build target

[edmundhung]

Fixes #[insert GH or internal issue link(s)].

Just a quick prototype. Not meant to be merged.

---

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[ask-bonk]

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commit: 6b3f7ba

[ask-bonk]

I've reviewed enough. The PR is an explicit prototype ("Just a quick prototype. Not meant to be merged."). The code degrades gracefully on the intended path (unstable_assembleWorkerdConfig → unstable_getConfig + dispose).

Let me do a final check on one potential real bug: in the vite plugin, getWorkerConfigs is called for ALL workers, including the prerender config. But more importantly, the name: options.name ?? workerConfig.name — workerConfig.name could be undefined per Unstable_Config. That's a minor robustness issue, not a clear bug.

The substantive issues I found are all on non-prototype paths that aren't reached by the intended flow. Given the explicit prototype framing and pragmatic review guidelines, there are no actionable issues that would block this prototype on its intended path. The only genuinely useful note is the #runtimeEntryURL assertion making ready/getURL/dispatchFetch throw in workerd-output mode — but that's by design for this mode and not used by the intended entry point.

There are no concrete, actionable bugs on the code paths this PR is meant to exercise.

LGTM

github run